On Jul 15, 2013, at 11:06 AM, Ed Singleton <[email protected]> wrote:
> I have two tables in SQLAlchemy which are identical and I want to update one
> from the other where the rows have the same primary key, and I want to do it
> in an efficient way.
>
> I tried joining the tables on the primary key, but SQLAlchemy doesn't appear
> to support updates on joined tables at the moment (except using a subquery
> for every column, which was too inefficient).
SQLAlchemy supports this for those backends which also do, SQL Server is
included, you just wouldn't use the JOIN keyword, instead use an implicit join.
Example:
addresses.update().
values(email_address=users.c.name).
where(users.c.id == addresses.c.user_id).
where(users.c.name == 'ed')
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