pinker <pin...@onet.eu> writes:
> Something strange happened to me right now. I'm trying to compare results
> from one query with rewritten version and everything is ok with this order:
> WITH abc AS (SELECT 1) SELECT 1
> except all
> SELECT 1
> but when I'm trying other way around it throws an error:
> SELECT 1
> except all
> WITH abc AS (SELECT 1) SELECT 1
You need some parens:
# SELECT 1
except all
(WITH abc AS (SELECT 1) SELECT 1);
?column?
----------
(0 rows)
In your first example, the WITH actually attaches to the whole EXCEPT
construct, not the first sub-select as I suspect you're thinking.
In short: WITH has lower syntactic precedence than UNION/INTERSECT/EXCEPT.
You need parens if you want it to work the other way 'round.
regards, tom lane
