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Classe « ScalarSelect »

Méthode sqlalchemy.ScalarSelect.correlate

Signature de la méthode correlate

def correlate(self, *fromclauses: 'Union[Literal[None, False], _FromClauseArgument]') -> 'Self' 

Description

help(ScalarSelect.correlate)

Return a new :class:`_expression.ScalarSelect`
which will correlate the given FROM
clauses to that of an enclosing :class:`_expression.Select`.

This method is mirrored from the :meth:`_sql.Select.correlate` method
of the underlying :class:`_sql.Select`.  The method applies the
:meth:_sql.Select.correlate` method, then returns a new
:class:`_sql.ScalarSelect` against that statement.

.. versionadded:: 1.4 Previously, the
   :meth:`_sql.ScalarSelect.correlate`
   method was only available from :class:`_sql.Select`.

:param \*fromclauses: a list of one or more
 :class:`_expression.FromClause`
 constructs, or other compatible constructs (i.e. ORM-mapped
 classes) to become part of the correlate collection.

.. seealso::

    :meth:`_expression.ScalarSelect.correlate_except`

    :ref:`tutorial_scalar_subquery` - in the 2.0 tutorial

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