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Classe « SelectBase »

Méthode sqlalchemy.SelectBase.scalar_subquery

Signature de la méthode scalar_subquery

def scalar_subquery(self) -> 'ScalarSelect[Any]' 

Description

help(SelectBase.scalar_subquery)

Return a 'scalar' representation of this selectable, which can be
used as a column expression.

The returned object is an instance of :class:`_sql.ScalarSelect`.

Typically, a select statement which has only one column in its columns
clause is eligible to be used as a scalar expression.  The scalar
subquery can then be used in the WHERE clause or columns clause of
an enclosing SELECT.

Note that the scalar subquery differentiates from the FROM-level
subquery that can be produced using the
:meth:`_expression.SelectBase.subquery`
method.

.. versionchanged: 1.4 - the ``.as_scalar()`` method was renamed to
   :meth:`_expression.SelectBase.scalar_subquery`.

.. seealso::

    :ref:`tutorial_scalar_subquery` - in the 2.0 tutorial

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