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Classe « FromClause »

Méthode sqlalchemy.FromClause.join

Signature de la méthode join

def join(self, right: '_FromClauseArgument', onclause: 'Optional[_ColumnExpressionArgument[bool]]' = None, isouter: 'bool' = False, full: 'bool' = False) -> 'Join' 

Description

help(FromClause.join)

Return a :class:`_expression.Join` from this
:class:`_expression.FromClause`
to another :class:`FromClause`.

E.g.::

    from sqlalchemy import join

    j = user_table.join(
        address_table, user_table.c.id == address_table.c.user_id
    )
    stmt = select(user_table).select_from(j)

would emit SQL along the lines of:

.. sourcecode:: sql

    SELECT user.id, user.name FROM user
    JOIN address ON user.id = address.user_id

:param right: the right side of the join; this is any
 :class:`_expression.FromClause` object such as a
 :class:`_schema.Table` object, and
 may also be a selectable-compatible object such as an ORM-mapped
 class.

:param onclause: a SQL expression representing the ON clause of the
 join.  If left at ``None``, :meth:`_expression.FromClause.join`
 will attempt to
 join the two tables based on a foreign key relationship.

:param isouter: if True, render a LEFT OUTER JOIN, instead of JOIN.

:param full: if True, render a FULL OUTER JOIN, instead of LEFT OUTER
 JOIN.  Implies :paramref:`.FromClause.join.isouter`.

.. seealso::

    :func:`_expression.join` - standalone function

    :class:`_expression.Join` - the type of object produced

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