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defined in this module they are intended to be agnostic of any vendor-specific
constructs.

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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.

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are defined in :class:`~sqlalchemy.sql.expression.`, specifically
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        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
        explicitly 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``.

        .. 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.

        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 resolve_fks: Whether or not to reflect :class:`.Table` objects
        related to this one via :class:`.ForeignKey` objects, when
        :paramref:`.Table.autoload` or :paramref:`.Table.autoload_with` is
        specified.   Defaults to True.  Set to False to disable reflection of
        related tables as :class:`.ForeignKey` objects are encountered; may be
        used either to save on SQL calls or to avoid issues with related tables
        that can't be accessed. Note that if a related table is already present
        in the :class:`.MetaData` collection, or becomes present later, a
        :class:`.ForeignKey` object associated with this :class:`.Table` will
        resolve to that table normally.

        .. versionadded:: 1.3

        .. seealso::

            :paramref:`.MetaData.reflect.resolve_fks`


    :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``.

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        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`.

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    :param useexisting: the same as :paramref:`.Table.extend_existing`.

    :param comment: Optional string that will render an SQL comment on table
         creation.

         .. versionadded:: 1.2 Added the :paramref:`.Table.comment` parameter
            to :class:`.Table`.

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

    Rtuseexistings0.7s�The :paramref:`.Table.useexisting` parameter is deprecated and will be removed in a future release.  Please use :paramref:`.Table.extend_existing`.c
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            m2 = MetaData()
            user_copy = user.tometadata(m2)

        :param metadata: Target :class:`.MetaData` object, into which the
         new :class:`.Table` object will be created.

        :param schema: optional string name indicating the target schema.
         Defaults to the special symbol :attr:`.RETAIN_SCHEMA` which indicates
         that no change to the schema name should be made in the new
         :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
         set explicitly::

            m2 = MetaData(schema='newschema')

            # user_copy_one will have "newschema" as the schema name
            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
         in order to provide for the schema name that should be assigned
         to the referenced table of a :class:`.ForeignKeyConstraint`.
         The callable accepts this parent :class:`.Table`, the
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                def referred_schema_fn(table, to_schema,
                                                constraint, referred_schema):
                    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.
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        Construct a new ``Column`` object.

        :param name: The name of this column as represented in the database.
          This argument may be the first positional argument, or specified
          via keyword.

          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: Set up "auto increment" semantics for an integer
          primary key column.  The default value is the string ``"auto"``
          which indicates that a single-column primary key that is of
          an INTEGER type with no stated client-side or python-side defaults
          should receive auto increment semantics automatically;
          all other varieties of primary key columns will not.  This
          includes that :term:`DDL` such as PostgreSQL SERIAL or MySQL
          AUTO_INCREMENT will be emitted for this column during a table
          create, as well as that the column is assumed to generate new
          integer primary key values when an INSERT statement invokes which
          will be retrieved by the dialect.

          The flag may be set to ``True`` to indicate that a column which
          is part of a composite (e.g. multi-column) primary key should
          have autoincrement semantics, though note that only one column
          within a primary key may have this setting.    It can also
          be set to ``True`` to indicate autoincrement semantics on a
          column that has a client-side or server-side default configured,
          however note that not all dialects can accommodate all styles
          of default as an "autoincrement".  It can also be
          set to ``False`` on a single-column primary key that has a
          datatype of INTEGER in order to disable auto increment semantics
          for that column.

          .. versionchanged:: 1.1 The autoincrement flag now defaults to
             ``"auto"`` which indicates autoincrement semantics by default
             for single-column integer primary keys only; for composite
             (multi-column) primary keys, autoincrement is never implicitly
             enabled; as always, ``autoincrement=True`` will allow for
             at most one of those columns to be an "autoincrement" column.
             ``autoincrement=True`` may also be set on a :class:`.Column`
             that has an explicit client-side or server-side default,
             subject to limitations of the backend database and dialect.


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

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

          * Part of the primary key

          * Not referring 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 a
            column that refers to another via foreign key, as such a column is
            required to refer to a value that originates from elsewhere.

          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 using an
            "autoincrement" method specific to the backend database, such
            as calling upon ``cursor.lastrowid``, using RETURNING in an
            INSERT statement to get at a sequence-generated value, or using
            special functions such as "SELECT scope_identity()".
            These methods are highly specific to the DBAPIs and databases in
            use and vary greatly, so care should be taken when associating
            ``autoincrement=True`` with a custom default generation function.


        :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 on the Python side.   This attribute does
            **not** render SQL comments; use the :paramref:`.Column.comment`
            parameter for this purpose.

        :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 will 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`.

        :param comment: Optional string that will render an SQL comment on
             table creation.

             .. versionadded:: 1.2 Added the :paramref:`.Column.comment`
                parameter to :class:`.Column`.


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        >>> 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(
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                   primary_key=True, nullable=False),
            Column('version_id', Integer(), table=<mytable>,
                   primary_key=True, nullable=False)
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    The primary key of a :class:`.Table` can also be specified by using
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        my_table = Table('mytable', metadata,
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                    PrimaryKeyConstraint('id', 'version_id',
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    The two styles of column-specification should generally not be mixed.
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    marked as ``primary_key=True`` are ignored.  This behavior is intended to
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       :class:`.PrimaryKeyConstraint` in addition to columns marked as
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       The ultimate behavior of ignoring those columns marked with the flag
       only is currently maintained for backwards compatibility; this warning
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    :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"
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                    )

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

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

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                        Column("address", String(100)),
                        Index("some_index", "name", "address")
                )

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        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
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        :param quote=None:
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            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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        :param naming_convention: a dictionary referring to values which
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