Michael Landin Hostbaek skrev:
> Hello,
>
> I have a table called tracking, with a contactid varchar, click bool,
> view bool and cid varchar.
>
> I would like to put the following into one single query if possible:
>
> // Number of clicks
> select cid,count(distinct contactid) from tracking where click =
> true group by cid;
>
> // Number of views
> select cid,count(distinct contactid) from tracking where view =
> true group by cid;
Untested, not the cleverest formulation, but something like this should
work:
SELECT * FROM
(
select cid,count(distinct contactid) from tracking where click =
true group by cid
) c1
FULL OUTER JOIN
(
select cid,count(distinct contactid) from tracking where view =
true group by cid
) c2
USING (cid);
---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
