From ef7ff058eb67d73ebeac7b125ab2a7806e14629c Mon Sep 17 00:00:00 2001 From: Mike Bayer Date: Thu, 13 Jun 2019 12:37:22 -0400 Subject: SelectBase no longer a FromClause As part of the SQLAlchemy 2.0 migration project, a conceptual change has been made to the role of the :class:`.SelectBase` class hierarchy, which is the root of all "SELECT" statement constructs, in that they no longer serve directly as FROM clauses, that is, they no longer subclass :class:`.FromClause`. For end users, the change mostly means that any placement of a :func:`.select` construct in the FROM clause of another :func:`.select` requires first that it be wrapped in a subquery first, which historically is through the use of the :meth:`.SelectBase.alias` method, and is now also available through the use of :meth:`.SelectBase.subquery`. This was usually a requirement in any case since several databases don't accept unnamed SELECT subqueries in their FROM clause in any case. See the documentation in this change for lots more detail. Fixes: #4617 Change-Id: I0f6174ee24b9a1a4529168e52e855e12abd60667 --- lib/sqlalchemy/sql/__init__.py | 1 + 1 file changed, 1 insertion(+) (limited to 'lib/sqlalchemy/sql/__init__.py') diff --git a/lib/sqlalchemy/sql/__init__.py b/lib/sqlalchemy/sql/__init__.py index 00cafd8ff..bf5468aa5 100644 --- a/lib/sqlalchemy/sql/__init__.py +++ b/lib/sqlalchemy/sql/__init__.py @@ -58,6 +58,7 @@ from .expression import quoted_name # noqa from .expression import Select # noqa from .expression import select # noqa from .expression import Selectable # noqa +from .expression import Subquery # noqa from .expression import subquery # noqa from .expression import table # noqa from .expression import TableClause # noqa -- cgit v1.2.1