PG Doc comments form <nore...@postgresql.org> writes:
> Regarding section 7.4 of the documentation. I was curious about the
> behavior when combining different set operations in one query, e.g,
> query1 op1 query2 op2 query3;
> where op1 and op2 are one of UNION, INTERSECT, EXCEPT.
> The documentation suggests that this is equivalent to
> (query1 op1 query2) op2 query3;
> but only states it for the case when op1 = op2 = UNION.
The SELECT reference page explains that INTERSECT binds more tightly
than UNION or EXCEPT. I think it's an oversight that section 7.4
doesn't mention that.
regards, tom lane
