OK well
https://bitbucket.org/zzzeek/sqlalchemy/issue/3044/insert-from-select-union has
a patch, that's what we'll be doing.
a workaround might be to monkeypatch select() for now:
sel = select(
[b_id, product.c.id],
).union(
select([b_id, s_id])
)
sel.select = lambda : sel
On May 8, 2014, at 6:27 PM, gbr <doubl...@directbox.com> wrote:
> So what can I do? I'm using postgres 9.3
>
> The error message I get is:
>
> ProgrammingError: (ProgrammingError) subquery in FROM must have an alias
> LINE 2: FROM (SELECT 2, product_id
> ^
> HINT: For example, FROM (SELECT ...) [AS] foo.
>
> Adding `sel = sel.alias()` doesn't do anything (same error message).
>
>
> On Friday, May 9, 2014 5:28:32 AM UTC+10, Michael Bayer wrote:
> this can't be avoided right now as the insert from select feature checks the
> incoming object as a "Select", which a "UNION" is not; it then calls select()
> on that union.
>
> a lot of databases have trouble with a raw UNION like that, we can loosen
> this restriction to apply to union-orinented selects as well but it's not
> clear if some backends might have problems with it.
>
> On May 8, 2014, at 4:28 AM, gbr <doub...@directbox.com> wrote:
>
>> I don't quite understand why SQLA generates this query. For some reason it
>> wraps the union part into a separate select. How can I avoid this?
>>
>> b_id = 2
>> s_id = 3
>> id = product.c.id
>> sel = select(
>> [b_id, product.c.id],
>> ).union(
>> select([b_id, s_id])
>> )
>>
>> ins = insert(product).from_select([
>> product.c.id, product.c.other_id
>> ],
>> sel
>> )
>> print ins
>> # produces:
>> # INSERT INTO product (id, other_id) SELECT 2, id
>> # FROM (SELECT 2, product.id AS id
>> # FROM product UNION SELECT 2, 3)
>>
>> # I would expect:
>> # INSERT INTO product (id, other_id) FROM
>> # SELECT 2, product.id AS id FROM product
>> # UNION
>> # SELECT 2, 3
>>
>> Where is the additional `SELECT 2, id` coming from?
>>
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