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Each element within this module describes a database entity which can be
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tables, columns, sequences, and indexes.

All entities are subclasses of :class:`~sqlalchemy.schema.SchemaItem`, and as
defined in this module they are intended to be agnostic of any vendor-specific
constructs.

A collection of entities are grouped into a unit called
:class:`~sqlalchemy.schema.MetaData`. MetaData serves as a logical grouping of
schema elements, and can also be associated with an actual database connection
such that operations involving the contained elements can contact the database
as needed.

Two of the elements here also build upon their "syntactic" counterparts, which
are defined in :class:`~sqlalchemy.sql.expression.`, specifically
:class:`~sqlalchemy.schema.Table` and :class:`~sqlalchemy.schema.Column`.
Since these objects are part of the SQL expression language, they are usable
as components in SQL expressions.

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tTablecB@sX
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Z!e ed„Z"e ed„Z#e$e e d„Z%RS(s/Represent a table in a database.

    e.g.::

        mytable = Table("mytable", metadata,
                        Column('mytable_id', Integer, primary_key=True),
                        Column('value', String(50))
                   )

    The :class:`.Table` object constructs a unique instance of itself based
    on its name and optional schema name within the given
    :class:`.MetaData` object. Calling the :class:`.Table`
    constructor with the same name and same :class:`.MetaData` argument
    a second time will return the *same* :class:`.Table` object - in this way
    the :class:`.Table` constructor acts as a registry function.

    .. seealso::

        :ref:`metadata_describing` - Introduction to database metadata

    Constructor arguments are as follows:

    :param name: The name of this table as represented in the database.

        The table name, along with the value of the ``schema`` parameter,
        forms a key which uniquely identifies this :class:`.Table` within
        the owning :class:`.MetaData` collection.
        Additional calls to :class:`.Table` with the same name, metadata,
        and schema name will return the same :class:`.Table` object.

        Names which contain no upper case characters
        will be treated as case insensitive names, and will not be quoted
        unless they are a reserved word or contain special characters.
        A name with any number of upper case characters is considered
        to be case sensitive, and will be sent as quoted.

        To enable unconditional quoting for the table name, specify the flag
        ``quote=True`` to the constructor, or use the :class:`.quoted_name`
        construct to specify the name.

    :param metadata: a :class:`.MetaData` object which will contain this
        table.  The metadata is used as a point of association of this table
        with other tables which are referenced via foreign key.  It also
        may be used to associate this table with a particular
        :class:`.Connectable`.

    :param \*args: Additional positional arguments are used primarily
        to add the list of :class:`.Column` objects contained within this
        table. Similar to the style of a CREATE TABLE statement, other
        :class:`.SchemaItem` constructs may be added here, including
        :class:`.PrimaryKeyConstraint`, and :class:`.ForeignKeyConstraint`.

    :param autoload: Defaults to False, unless :paramref:`.Table.autoload_with`
        is set in which case it defaults to True; :class:`.Column` objects
        for this table should be reflected from the database, possibly
        augmenting or replacing existing :class:`.Column` objects that were
        expicitly specified.

        .. versionchanged:: 1.0.0 setting the :paramref:`.Table.autoload_with`
           parameter implies that :paramref:`.Table.autoload` will default
           to True.

        .. seealso::

            :ref:`metadata_reflection_toplevel`

    :param autoload_replace: Defaults to ``True``; when using
        :paramref:`.Table.autoload`
        in conjunction with :paramref:`.Table.extend_existing`, indicates
        that :class:`.Column` objects present in the already-existing
        :class:`.Table` object should be replaced with columns of the same
        name retrieved from the autoload process.   When ``False``, columns
        already present under existing names will be omitted from the
        reflection process.

        Note that this setting does not impact :class:`.Column` objects
        specified programmatically within the call to :class:`.Table` that
        also is autoloading; those :class:`.Column` objects will always
        replace existing columns of the same name when
        :paramref:`.Table.extend_existing` is ``True``.

        .. versionadded:: 0.7.5

        .. seealso::

            :paramref:`.Table.autoload`

            :paramref:`.Table.extend_existing`

    :param autoload_with: An :class:`.Engine` or :class:`.Connection` object
        with which this :class:`.Table` object will be reflected; when
        set to a non-None value, it implies that :paramref:`.Table.autoload`
        is ``True``.   If left unset, but :paramref:`.Table.autoload` is
        explicitly set to ``True``, an autoload operation will attempt to
        proceed by locating an :class:`.Engine` or :class:`.Connection` bound
        to the underlying :class:`.MetaData` object.

        .. seealso::

            :paramref:`.Table.autoload`

    :param extend_existing: When ``True``, indicates that if this
        :class:`.Table` is already present in the given :class:`.MetaData`,
        apply further arguments within the constructor to the existing
        :class:`.Table`.

        If :paramref:`.Table.extend_existing` or
        :paramref:`.Table.keep_existing` are not set, and the given name
        of the new :class:`.Table` refers to a :class:`.Table` that is
        already present in the target :class:`.MetaData` collection, and
        this :class:`.Table` specifies additional columns or other constructs
        or flags that modify the table's state, an
        error is raised.  The purpose of these two mutually-exclusive flags
        is to specify what action should be taken when a :class:`.Table`
        is specified that matches an existing :class:`.Table`, yet specifies
        additional constructs.

        :paramref:`.Table.extend_existing` will also work in conjunction
        with :paramref:`.Table.autoload` to run a new reflection
        operation against the database, even if a :class:`.Table`
        of the same name is already present in the target
        :class:`.MetaData`; newly reflected :class:`.Column` objects
        and other options will be added into the state of the
        :class:`.Table`, potentially overwriting existing columns
        and options of the same name.

        .. versionchanged:: 0.7.4 :paramref:`.Table.extend_existing` will
           invoke a new reflection operation when combined with
           :paramref:`.Table.autoload` set to True.

        As is always the case with :paramref:`.Table.autoload`,
        :class:`.Column` objects can be specified in the same :class:`.Table`
        constructor, which will take precedence.  Below, the existing
        table ``mytable`` will be augmented with :class:`.Column` objects
        both reflected from the database, as well as the given :class:`.Column`
        named "y"::

            Table("mytable", metadata,
                        Column('y', Integer),
                        extend_existing=True,
                        autoload=True,
                        autoload_with=engine
                    )

        .. seealso::

            :paramref:`.Table.autoload`

            :paramref:`.Table.autoload_replace`

            :paramref:`.Table.keep_existing`


    :param implicit_returning: True by default - indicates that
        RETURNING can be used by default to fetch newly inserted primary key
        values, for backends which support this.  Note that
        create_engine() also provides an implicit_returning flag.

    :param include_columns: A list of strings indicating a subset of
        columns to be loaded via the ``autoload`` operation; table columns who
        aren't present in this list will not be represented on the resulting
        ``Table`` object. Defaults to ``None`` which indicates all columns
        should be reflected.

    :param info: Optional data dictionary which will be populated into the
        :attr:`.SchemaItem.info` attribute of this object.

    :param keep_existing: When ``True``, indicates that if this Table
        is already present in the given :class:`.MetaData`, ignore
        further arguments within the constructor to the existing
        :class:`.Table`, and return the :class:`.Table` object as
        originally created. This is to allow a function that wishes
        to define a new :class:`.Table` on first call, but on
        subsequent calls will return the same :class:`.Table`,
        without any of the declarations (particularly constraints)
        being applied a second time.

        If :paramref:`.Table.extend_existing` or
        :paramref:`.Table.keep_existing` are not set, and the given name
        of the new :class:`.Table` refers to a :class:`.Table` that is
        already present in the target :class:`.MetaData` collection, and
        this :class:`.Table` specifies additional columns or other constructs
        or flags that modify the table's state, an
        error is raised.  The purpose of these two mutually-exclusive flags
        is to specify what action should be taken when a :class:`.Table`
        is specified that matches an existing :class:`.Table`, yet specifies
        additional constructs.

        .. seealso::

            :paramref:`.Table.extend_existing`

    :param listeners: A list of tuples of the form ``(<eventname>, <fn>)``
        which will be passed to :func:`.event.listen` upon construction.
        This alternate hook to :func:`.event.listen` allows the establishment
        of a listener function specific to this :class:`.Table` before
        the "autoload" process begins.  Particularly useful for
        the :meth:`.DDLEvents.column_reflect` event::

            def listen_for_reflect(table, column_info):
                "handle the column reflection event"
                # ...

            t = Table(
                'sometable',
                autoload=True,
                listeners=[
                    ('column_reflect', listen_for_reflect)
                ])

    :param mustexist: When ``True``, indicates that this Table must already
        be present in the given :class:`.MetaData` collection, else
        an exception is raised.

    :param prefixes:
        A list of strings to insert after CREATE in the CREATE TABLE
        statement.  They will be separated by spaces.

    :param quote: Force quoting of this table's name on or off, corresponding
        to ``True`` or ``False``.  When left at its default of ``None``,
        the column identifier will be quoted according to whether the name is
        case sensitive (identifiers with at least one upper case character are
        treated as case sensitive), or if it's a reserved word.  This flag
        is only needed to force quoting of a reserved word which is not known
        by the SQLAlchemy dialect.

    :param quote_schema: same as 'quote' but applies to the schema identifier.

    :param schema: The schema name for this table, which is required if
        the table resides in a schema other than the default selected schema
        for the engine's database connection.  Defaults to ``None``.

        If the owning :class:`.MetaData` of this :class:`.Table` specifies
        its own :paramref:`.MetaData.schema` parameter, then that schema
        name will be applied to this :class:`.Table` if the schema parameter
        here is set to ``None``.  To set a blank schema name on a :class:`.Table`
        that would otherwise use the schema set on the owning :class:`.MetaData`,
        specify the special symbol :attr:`.BLANK_SCHEMA`.

        .. versionadded:: 1.0.14  Added the :attr:`.BLANK_SCHEMA` symbol to
           allow a :class:`.Table` to have a blank schema name even when the
           parent :class:`.MetaData` specifies :paramref:`.MetaData.schema`.

        The quoting rules for the schema name are the same as those for the
        ``name`` parameter, in that quoting is applied for reserved words or
        case-sensitive names; to enable unconditional quoting for the
        schema name, specify the flag
        ``quote_schema=True`` to the constructor, or use the
        :class:`.quoted_name` construct to specify the name.

    :param useexisting: Deprecated.  Use :paramref:`.Table.extend_existing`.

    :param \**kw: Additional keyword arguments not mentioned above are
        dialect specific, and passed in the form ``<dialectname>_<argname>``.
        See the documentation regarding an individual dialect at
        :ref:`dialect_toplevel` for detail on documented arguments.

    ttablec
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        Note that this does **not** change the definition of the table
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        table has already been created in the database.   Relational
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            m2 = MetaData()
            user_copy = user.tometadata(m2)

        :param metadata: Target :class:`.MetaData` object, into which the
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        :param schema: optional string name indicating the target schema.
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         :class:`.Table`.  If set to a string name, the new :class:`.Table`
         will have this new name as the ``.schema``.  If set to ``None``, the
         schema will be set to that of the schema set on the target
         :class:`.MetaData`, which is typically ``None`` as well, unless
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            m2 = MetaData(schema='newschema')

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            user_copy_one = user.tometadata(m2, schema=None)

            m3 = MetaData()  # schema defaults to None

            # user_copy_two will have None as the schema name
            user_copy_two = user.tometadata(m3, schema=None)

        :param referred_schema_fn: optional callable which can be supplied
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         The callable accepts this parent :class:`.Table`, the
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         E.g.::

                def referred_schema_fn(table, to_schema,
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                    if referred_schema == 'base_tables':
                        return referred_schema
                    else:
                        return to_schema

                new_table = table.tometadata(m2, schema="alt_schema",
                                        referred_schema_fn=referred_schema_fn)

         .. versionadded:: 0.9.2

        :param name: optional string name indicating the target table name.
         If not specified or None, the table name is retained.  This allows
         a :class:`.Table` to be copied to the same :class:`.MetaData` target
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          Names which contain no upper case characters
          will be treated as case insensitive names, and will not be quoted
          unless they are a reserved word.  Names with any number of upper
          case characters will be quoted and sent exactly.  Note that this
          behavior applies even for databases which standardize upper
          case names as case insensitive such as Oracle.

          The name field may be omitted at construction time and applied
          later, at any time before the Column is associated with a
          :class:`.Table`.  This is to support convenient
          usage within the :mod:`~sqlalchemy.ext.declarative` extension.

        :param type\_: The column's type, indicated using an instance which
          subclasses :class:`~sqlalchemy.types.TypeEngine`.  If no arguments
          are required for the type, the class of the type can be sent
          as well, e.g.::

            # use a type with arguments
            Column('data', String(50))

            # use no arguments
            Column('level', Integer)

          The ``type`` argument may be the second positional argument
          or specified by keyword.

          If the ``type`` is ``None`` or is omitted, it will first default to
          the special type :class:`.NullType`.  If and when this
          :class:`.Column` is made to refer to another column using
          :class:`.ForeignKey` and/or :class:`.ForeignKeyConstraint`, the type
          of the remote-referenced column will be copied to this column as
          well, at the moment that the foreign key is resolved against that
          remote :class:`.Column` object.

          .. versionchanged:: 0.9.0
            Support for propagation of type to a :class:`.Column` from its
            :class:`.ForeignKey` object has been improved and should be
            more reliable and timely.

        :param \*args: Additional positional arguments include various
          :class:`.SchemaItem` derived constructs which will be applied
          as options to the column.  These include instances of
          :class:`.Constraint`, :class:`.ForeignKey`, :class:`.ColumnDefault`,
          and :class:`.Sequence`.  In some cases an equivalent keyword
          argument is available such as ``server_default``, ``default``
          and ``unique``.

        :param autoincrement: This flag may be set to ``False`` to
          indicate an integer primary key column that should not be
          considered to be the "autoincrement" column, that is
          the integer primary key column which generates values
          implicitly upon INSERT and whose value is usually returned
          via the DBAPI cursor.lastrowid attribute.   It defaults
          to ``True`` to satisfy the common use case of a table
          with a single integer primary key column.  If the table
          has a composite primary key consisting of more than one
          integer column, set this flag to True only on the
          column that should be considered "autoincrement".

          The setting *only* has an effect for columns which are:

          * Integer derived (i.e. INT, SMALLINT, BIGINT).

          * Part of the primary key

          * Not refering to another column via :class:`.ForeignKey`, unless
            the value is specified as ``'ignore_fk'``::

                # turn on autoincrement for this column despite
                # the ForeignKey()
                Column('id', ForeignKey('other.id'),
                            primary_key=True, autoincrement='ignore_fk')

            It is typically not desirable to have "autoincrement" enabled
            on such a column as its value intends to mirror that of a
            primary key column elsewhere.

          * have no server side or client side defaults (with the exception
            of Postgresql SERIAL).

          The setting has these two effects on columns that meet the
          above criteria:

          * DDL issued for the column will include database-specific
            keywords intended to signify this column as an
            "autoincrement" column, such as AUTO INCREMENT on MySQL,
            SERIAL on Postgresql, and IDENTITY on MS-SQL.  It does
            *not* issue AUTOINCREMENT for SQLite since this is a
            special SQLite flag that is not required for autoincrementing
            behavior.

            .. seealso::

                :ref:`sqlite_autoincrement`

          * The column will be considered to be available as
            cursor.lastrowid or equivalent, for those dialects which
            "post fetch" newly inserted identifiers after a row has
            been inserted (SQLite, MySQL, MS-SQL).  It does not have
            any effect in this regard for databases that use sequences
            to generate primary key identifiers (i.e. Firebird, Postgresql,
            Oracle).

          .. versionchanged:: 0.7.4
              ``autoincrement`` accepts a special value ``'ignore_fk'``
              to indicate that autoincrementing status regardless of foreign
              key references.  This applies to certain composite foreign key
              setups, such as the one demonstrated in the ORM documentation
              at :ref:`post_update`.

        :param default: A scalar, Python callable, or
            :class:`.ColumnElement` expression representing the
            *default value* for this column, which will be invoked upon insert
            if this column is otherwise not specified in the VALUES clause of
            the insert. This is a shortcut to using :class:`.ColumnDefault` as
            a positional argument; see that class for full detail on the
            structure of the argument.

            Contrast this argument to :paramref:`.Column.server_default`
            which creates a default generator on the database side.

            .. seealso::

                :ref:`metadata_defaults_toplevel`

        :param doc: optional String that can be used by the ORM or similar
            to document attributes.   This attribute does not render SQL
            comments (a future attribute 'comment' will achieve that).

        :param key: An optional string identifier which will identify this
            ``Column`` object on the :class:`.Table`. When a key is provided,
            this is the only identifier referencing the ``Column`` within the
            application, including ORM attribute mapping; the ``name`` field
            is used only when rendering SQL.

        :param index: When ``True``, indicates that the column is indexed.
            This is a shortcut for using a :class:`.Index` construct on the
            table. To specify indexes with explicit names or indexes that
            contain multiple columns, use the :class:`.Index` construct
            instead.

        :param info: Optional data dictionary which will be populated into the
            :attr:`.SchemaItem.info` attribute of this object.

        :param nullable: When set to ``False``, will cause the "NOT NULL"
            phrase to be added when generating DDL for the column.   When
            ``True``, will normally generate nothing (in SQL this defaults to
            "NULL"), except in some very specific backend-specific edge cases
            where "NULL" may render explicitly.   Defaults to ``True`` unless
            :paramref:`~.Column.primary_key` is also ``True``, in which case it
            defaults to ``False``.  This parameter is only used when issuing
            CREATE TABLE statements.

        :param onupdate: A scalar, Python callable, or
            :class:`~sqlalchemy.sql.expression.ClauseElement` representing a
            default value to be applied to the column within UPDATE
            statements, which wil be invoked upon update if this column is not
            present in the SET clause of the update. This is a shortcut to
            using :class:`.ColumnDefault` as a positional argument with
            ``for_update=True``.

            .. seealso::

                :ref:`metadata_defaults` - complete discussion of onupdate

        :param primary_key: If ``True``, marks this column as a primary key
            column. Multiple columns can have this flag set to specify
            composite primary keys. As an alternative, the primary key of a
            :class:`.Table` can be specified via an explicit
            :class:`.PrimaryKeyConstraint` object.

        :param server_default: A :class:`.FetchedValue` instance, str, Unicode
            or :func:`~sqlalchemy.sql.expression.text` construct representing
            the DDL DEFAULT value for the column.

            String types will be emitted as-is, surrounded by single quotes::

                Column('x', Text, server_default="val")

                x TEXT DEFAULT 'val'

            A :func:`~sqlalchemy.sql.expression.text` expression will be
            rendered as-is, without quotes::

                Column('y', DateTime, server_default=text('NOW()'))

                y DATETIME DEFAULT NOW()

            Strings and text() will be converted into a
            :class:`.DefaultClause` object upon initialization.

            Use :class:`.FetchedValue` to indicate that an already-existing
            column will generate a default value on the database side which
            will be available to SQLAlchemy for post-fetch after inserts. This
            construct does not specify any DDL and the implementation is left
            to the database, such as via a trigger.

            .. seealso::

                :ref:`server_defaults` - complete discussion of server side
                defaults

        :param server_onupdate:   A :class:`.FetchedValue` instance
             representing a database-side default generation function,
             such as a trigger. This
             indicates to SQLAlchemy that a newly generated value will be
             available after updates. This construct does not actually
             implement any kind of generation function within the database,
             which instead must be specified separately.

            .. seealso::

                :ref:`triggered_columns`

        :param quote: Force quoting of this column's name on or off,
             corresponding to ``True`` or ``False``. When left at its default
             of ``None``, the column identifier will be quoted according to
             whether the name is case sensitive (identifiers with at least one
             upper case character are treated as case sensitive), or if it's a
             reserved word. This flag is only needed to force quoting of a
             reserved word which is not known by the SQLAlchemy dialect.

        :param unique: When ``True``, indicates that this column contains a
             unique constraint, or if ``index`` is ``True`` as well, indicates
             that the :class:`.Index` should be created with the unique flag.
             To specify multiple columns in the constraint/index or to specify
             an explicit name, use the :class:`.UniqueConstraint` or
             :class:`.Index` constructs explicitly.

        :param system: When ``True``, indicates this is a "system" column,
             that is a column which is automatically made available by the
             database, and should not be included in the columns list for a
             ``CREATE TABLE`` statement.

             For more elaborate scenarios where columns should be
             conditionally rendered differently on different backends,
             consider custom compilation rules for :class:`.CreateColumn`.

             .. versionadded:: 0.8.3 Added the ``system=True`` parameter to
                :class:`.Column`.

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          Optional string.  If set, emit INITIALLY <value> when issuing DDL
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A table-level FOREIGN KEY constraint.

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          ``link_to_name`` is True.

        :param refcolumns: A sequence of foreign column names or Column
          objects. The columns must all be located within the same Table.

        :param name: Optional, the in-database name of the key.

        :param onupdate: Optional string. If set, emit ON UPDATE <value> when
          issuing DDL for this constraint. Typical values include CASCADE,
          DELETE and RESTRICT.

        :param ondelete: Optional string. If set, emit ON DELETE <value> when
          issuing DDL for this constraint. Typical values include CASCADE,
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          issuing DDL for this constraint.

        :param link_to_name: if True, the string name given in ``column`` is
          the rendered name of the referenced column, not its locally assigned
          ``key``.

        :param use_alter: If True, do not emit the DDL for this constraint as
          part of the CREATE TABLE definition. Instead, generate it via an
          ALTER TABLE statement issued after the full collection of tables
          have been created, and drop it via an ALTER TABLE statement before
          the full collection of tables are dropped.

          The use of :paramref:`.ForeignKeyConstraint.use_alter` is
          particularly geared towards the case where two or more tables
          are established within a mutually-dependent foreign key constraint
          relationship; however, the :meth:`.MetaData.create_all` and
          :meth:`.MetaData.drop_all` methods will perform this resolution
          automatically, so the flag is normally not needed.

          .. versionchanged:: 1.0.0  Automatic resolution of foreign key
             cycles has been added, removing the need to use the
             :paramref:`.ForeignKeyConstraint.use_alter` in typical use
             cases.

          .. seealso::

                :ref:`use_alter`

        :param match: Optional string. If set, emit MATCH <value> when issuing
          DDL for this constraint. Typical values include SIMPLE, PARTIAL
          and FULL.

        :param info: Optional data dictionary which will be populated into the
            :attr:`.SchemaItem.info` attribute of this object.

            .. versionadded:: 1.0.0

        :param \**dialect_kw:  Additional keyword arguments are dialect
          specific, and passed in the form ``<dialectname>_<argname>``.  See
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The :class:`.Table` object to which this
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A table-level PRIMARY KEY constraint.

    The :class:`.PrimaryKeyConstraint` object is present automatically
    on any :class:`.Table` object; it is assigned a set of
    :class:`.Column` objects corresponding to those marked with
    the :paramref:`.Column.primary_key` flag::

        >>> my_table = Table('mytable', metadata,
        ...                 Column('id', Integer, primary_key=True),
        ...                 Column('version_id', Integer, primary_key=True),
        ...                 Column('data', String(50))
        ...     )
        >>> my_table.primary_key
        PrimaryKeyConstraint(
            Column('id', Integer(), table=<mytable>,
                   primary_key=True, nullable=False),
            Column('version_id', Integer(), table=<mytable>,
                   primary_key=True, nullable=False)
        )

    The primary key of a :class:`.Table` can also be specified by using
    a :class:`.PrimaryKeyConstraint` object explicitly; in this mode of usage,
    the "name" of the constraint can also be specified, as well as other
    options which may be recognized by dialects::

        my_table = Table('mytable', metadata,
                    Column('id', Integer),
                    Column('version_id', Integer),
                    Column('data', String(50)),
                    PrimaryKeyConstraint('id', 'version_id',
                                         name='mytable_pk')
                )

    The two styles of column-specification should generally not be mixed.
    An warning is emitted if the columns present in the
    :class:`.PrimaryKeyConstraint`
    don't match the columns that were marked as ``primary_key=True``, if both
    are present; in this case, the columns are taken strictly from the
    :class:`.PrimaryKeyConstraint` declaration, and those columns otherwise
    marked as ``primary_key=True`` are ignored.  This behavior is intended to
    be backwards compatible with previous behavior.

    .. versionchanged:: 0.9.2  Using a mixture of columns within a
       :class:`.PrimaryKeyConstraint` in addition to columns marked as
       ``primary_key=True`` now emits a warning if the lists don't match.
       The ultimate behavior of ignoring those columns marked with the flag
       only is currently maintained for backwards compatibility; this warning
       may raise an exception in a future release.

    For the use case where specific options are to be specified on the
    :class:`.PrimaryKeyConstraint`, but the usual style of using
    ``primary_key=True`` flags is still desirable, an empty
    :class:`.PrimaryKeyConstraint` may be specified, which will take on the
    primary key column collection from the :class:`.Table` based on the
    flags::

        my_table = Table('mytable', metadata,
                    Column('id', Integer, primary_key=True),
                    Column('version_id', Integer, primary_key=True),
                    Column('data', String(50)),
                    PrimaryKeyConstraint(name='mytable_pk',
                                         mssql_clustered=True)
                )

    .. versionadded:: 0.9.2 an empty :class:`.PrimaryKeyConstraint` may now
       be specified for the purposes of establishing keyword arguments with
       the constraint, independently of the specification of "primary key"
       columns within the :class:`.Table` itself; columns marked as
       ``primary_key=True`` will be gathered into the empty constraint's
       column collection.

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A table-level UNIQUE constraint.

    Defines a single column or composite UNIQUE constraint. For a no-frills,
    single column constraint, adding ``unique=True`` to the ``Column``
    definition is a shorthand equivalent for an unnamed, single column
    UniqueConstraint.
    tunique_constraint(R5R6R7R8(((sJ/home/tvault/.virtenv/lib/python2.7/site-packages/sqlalchemy/sql/schema.pyR¾sRÁcB@sVeZ
dZd
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    Defines a composite (one or more column) INDEX.

    E.g.::

        sometable = Table("sometable", metadata,
                        Column("name", String(50)),
                        Column("address", String(100))
                    )

        Index("some_index", sometable.c.name)

    For a no-frills, single column index, adding
    :class:`.Column` also supports ``index=True``::

        sometable = Table("sometable", metadata,
                        Column("name", String(50), index=True)
                    )

    For a composite index, multiple columns can be specified::

        Index("some_index", sometable.c.name, sometable.c.address)

    Functional indexes are supported as well, typically by using the
    :data:`.func` construct in conjunction with table-bound
    :class:`.Column` objects::

        Index("some_index", func.lower(sometable.c.name))

    .. versionadded:: 0.8 support for functional and expression-based indexes.

    An :class:`.Index` can also be manually associated with a :class:`.Table`,
    either through inline declaration or using
    :meth:`.Table.append_constraint`.  When this approach is used, the names
    of the indexed columns can be specified as strings::

        Table("sometable", metadata,
                        Column("name", String(50)),
                        Column("address", String(100)),
                        Index("some_index", "name", "address")
                )

    To support functional or expression-based indexes in this form, the
    :func:`.text` construct may be used::

        from sqlalchemy import text

        Table("sometable", metadata,
                        Column("name", String(50)),
                        Column("address", String(100)),
                        Index("some_index", text("lower(name)"))
                )

    .. versionadded:: 0.9.5 the :func:`.text` construct may be used to
       specify :class:`.Index` expressions, provided the :class:`.Index`
       is explicitly associated with the :class:`.Table`.


    .. seealso::

        :ref:`schema_indexes` - General information on :class:`.Index`.

        :ref:`postgresql_indexes` - PostgreSQL-specific options available for
        the :class:`.Index` construct.

        :ref:`mysql_indexes` - MySQL-specific options available for the
        :class:`.Index` construct.

        :ref:`mssql_indexes` - MSSQL-specific options available for the
        :class:`.Index` construct.

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        :param name:
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        :param unique=False:
            Keyword only argument; if True, create a unique index.

        :param quote=None:
            Keyword only argument; whether to apply quoting to the name of
            the index.  Works in the same manner as that of
            :paramref:`.Column.quote`.

        :param info=None: Optional data dictionary which will be populated
            into the :attr:`.SchemaItem.info` attribute of this object.

            .. versionadded:: 1.0.0

        :param \**kw: Additional keyword arguments not mentioned above are
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    execution.

    The :class:`.Table` objects themselves are stored in the
    :attr:`.MetaData.tables` dictionary.

    :class:`.MetaData` is a thread-safe object for read operations.
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    .. seealso::

        :ref:`metadata_describing` - Introduction to database metadata

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ndS(s¥Create a new MetaData object.

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        :param reflect:
          Optional, automatically load all tables from the bound database.
          Defaults to False. ``bind`` is required when this option is set.

          .. deprecated:: 0.8
                Please use the :meth:`.MetaData.reflect` method.

        :param schema:
           The default schema to use for the :class:`.Table`,
           :class:`.Sequence`, and potentially other objects associated with
           this :class:`.MetaData`. Defaults to ``None``.

           When this value is set, any :class:`.Table` or :class:`.Sequence`
           which specifies ``None`` for the schema parameter will instead
           have this schema name defined.  To build a :class:`.Table`
           or :class:`.Sequence` that still has ``None`` for the schema
           even when this parameter is present, use the :attr:`.BLANK_SCHEMA`
           symbol.

           .. seealso::

                :paramref:`.Table.schema`

                :paramref:`.Sequence.schema`

        :param quote_schema:
            Sets the ``quote_schema`` flag for those :class:`.Table`,
            :class:`.Sequence`, and other objects which make usage of the
            local ``schema`` name.

        :param info: Optional data dictionary which will be populated into the
            :attr:`.SchemaItem.info` attribute of this object.

            .. versionadded:: 1.0.0

        :param naming_convention: a dictionary referring to values which
          will establish default naming conventions for :class:`.Constraint`
          and :class:`.Index` objects, for those objects which are not given
          a name explicitly.

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          * a constraint or Index class, e.g. the :class:`.UniqueConstraint`,
            :class:`.ForeignKeyConstraint` class, the :class:`.Index` class

          * a string mnemonic for one of the known constraint classes;
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          * the string name of a user-defined "token" that can be used
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          form ``fn(constraint, table)``, which accepts the constraint/index
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            * ``%(referred_table_name)s`` - the name of the :class:`.Table`
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            * ``%(column_0_name)s`` - the name of the :class:`.Column` at
              index position "0" within the constraint.

            * ``%(column_0_label)s`` - the label of the :class:`.Column` at
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            * ``%(column_0_key)s`` - the key of the :class:`.Column` at
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            * ``%(referred_column_0_name)s`` - the name of a :class:`.Column`
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            * user-defined: any additional token may be implemented by passing
              it along with a ``fn(constraint, table)`` callable to the
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          .. versionadded:: 0.9.2

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