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Classe « Select »

Méthode sqlalchemy.Select.reduce_columns

Signature de la méthode reduce_columns

def reduce_columns(self, only_synonyms: 'bool' = True) -> 'Select[Any]' 

Description

help(Select.reduce_columns)

Return a new :func:`_expression.select` construct with redundantly
named, equivalently-valued columns removed from the columns clause.

"Redundant" here means two columns where one refers to the
other either based on foreign key, or via a simple equality
comparison in the WHERE clause of the statement.   The primary purpose
of this method is to automatically construct a select statement
with all uniquely-named columns, without the need to use
table-qualified labels as
:meth:`_expression.Select.set_label_style`
does.

When columns are omitted based on foreign key, the referred-to
column is the one that's kept.  When columns are omitted based on
WHERE equivalence, the first column in the columns clause is the
one that's kept.

:param only_synonyms: when True, limit the removal of columns
 to those which have the same name as the equivalent.   Otherwise,
 all columns that are equivalent to another are removed.

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