Hi,
when creating a query with a subselect
SELECT name, (SELECT max(pop) FROM cities WHERE cities.state = states.name) AS max_pop
FROM states;
then it is not possible to sort after max_pop or use max_pop in a function or a CASE.
am I dont anything wrong or is this meant to be the case?
Thanks
Al
Hi,
On Tue, 2004-11-02 at 09:05, Alex P wrote:
> Hi,
>
> when creating a query with a subselect
>
> SELECT name, (SELECT max(pop) FROM cities WHERE cities.state = states.name) AS
> max_pop
> FROM states;
>
> then it is not possible to sort after max_pop or use max_pop in a function or a CA
You can't use the alias name in the sort, case, where etc.. you have
to use the entire subselect.
So you would order by (select max(pop)...)
and you would also case the full thing as well.
A bit of a pain but Tom Lane explained it in a post a couple days ago
and said the system was optimized so it
Alex P wrote:
Hi,
when creating a query with a subselect
SELECT name, (SELECT max(pop) FROM cities WHERE cities.state =
states.name) AS max_pop
FROM states;
then it is not possible to sort after max_pop or use max_pop in a
function or a CASE.
Here max_pop is naming the whole subselect. How ab
In the general case, is a subselect that uses union less performant
than a union?
I have a query that looks something like this:
select
from table1,
table2,
table3
where
union
select
fromtable1,
table2,
table3 ref1,
table3 ref2
wher
