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SELECT and Related Constructs
=================================
The term "selectable" refers to any object that represents database rows. In
SQLAlchemy, these objects descend from :class:`_expression.Selectable`, the
most prominent being :class:`_expression.Select`, which represents a SQL SELECT
statement. A subset of :class:`_expression.Selectable` is
:class:`_expression.FromClause`, which represents objects that can be within
the FROM clause of a :class:`.Select` statement. A distinguishing feature of
:class:`_expression.FromClause` is the :attr:`_expression.FromClause.c`
attribute, which is a namespace of all the columns contained within the FROM
clause (these elements are themselves :class:`_expression.ColumnElement`
subclasses).
.. currentmodule:: sqlalchemy.sql.expression
.. _selectable_foundational_constructors:
Selectable Foundational Constructors
--------------------------------------
Top level "FROM clause" and "SELECT" constructors.
.. autofunction:: except_
.. autofunction:: except_all
.. autofunction:: exists
.. autofunction:: intersect
.. autofunction:: intersect_all
.. autofunction:: select
.. autofunction:: table
.. autofunction:: union
.. autofunction:: union_all
.. autofunction:: values
.. _fromclause_modifier_constructors:
Selectable Modifier Constructors
---------------------------------
Functions listed here are more commonly available as methods from
:class:`_sql.FromClause` and :class:`_sql.Selectable` elements, for example,
the :func:`_sql.alias` function is usually invoked via the
:meth:`_sql.FromClause.alias` method.
.. autofunction:: alias
.. autofunction:: cte
.. autofunction:: join
.. autofunction:: lateral
.. autofunction:: outerjoin
.. autofunction:: tablesample
Selectable Class Documentation
--------------------------------
The classes here are generated using the constructors listed at
:ref:`selectable_foundational_constructors` and
:ref:`fromclause_modifier_constructors`.
.. autoclass:: Alias
:members:
.. autoclass:: AliasedReturnsRows
:members:
.. autoclass:: CompoundSelect
:inherited-members: ClauseElement
:members:
.. autoclass:: CTE
:members:
.. autoclass:: Executable
:members:
.. autoclass:: Exists
:members:
.. autoclass:: FromClause
:members:
.. autoclass:: GenerativeSelect
:members:
.. autoclass:: HasCTE
:members:
.. autoclass:: HasPrefixes
:members:
.. autoclass:: HasSuffixes
:members:
.. autoclass:: Join
:members:
.. autoclass:: Lateral
:members:
.. autoclass:: ReturnsRows
:members:
:inherited-members: ClauseElement
.. autoclass:: ScalarSelect
:members:
.. autoclass:: Select
:members:
:inherited-members: ClauseElement
:exclude-members: memoized_attribute, memoized_instancemethod, append_correlation, append_column, append_prefix, append_whereclause, append_having, append_from, append_order_by, append_group_by
.. autoclass:: Selectable
:members:
:inherited-members: ClauseElement
.. autoclass:: SelectBase
:members:
:inherited-members: ClauseElement
:exclude-members: memoized_attribute, memoized_instancemethod
.. autoclass:: Subquery
:members:
.. autoclass:: TableClause
:members:
:inherited-members:
.. autoclass:: TableSample
:members:
.. autoclass:: TableValuedAlias
:members:
.. autoclass:: TextualSelect
:members:
:inherited-members:
.. autoclass:: Values
:members:
:inherited-members: ClauseElement, FromClause, HasTraverseInternals, Selectable
.. autoclass:: ScalarValues
:members:
Label Style Constants
---------------------
Constants used with the :meth:`_sql.GenerativeSelect.set_label_style`
method.
.. autoclass:: SelectLabelStyle
:members:
.. seealso::
:meth:`_sql.Select.set_label_style`
:meth:`_sql.Select.get_label_style`
|
