The query below:
SELECT i_adgroup_id, i_category_id
FROM adgroupcategories_br
WHERE i_adgroup_id IN
(
SELECT i_adgroup_id
FROM adgroupusers_br
WHERE i_user_id = 103713
)
GROUP BY i_adgroup_id, i_category_id;
Gives me results like this:
i_adgroup_id integer | i_category_id smallint
---------------------|-----------------------
15938 | 2
15938 | 3
15938 | 4
15942 | 1
15942 | 2
What I want is results like this:
i_adgroup_id integer | i_category_id smallint[]
---------------------|-----------------------
15938 | { 2, 3, 4 }
15942 | { 1, 2 }
How can I change the original SQL query to give me the result above?
You want to use array_agg
, this should work:
SELECT i_adgroup_id, array_agg(i_category_id)
FROM adgroupcategories_br
WHERE i_adgroup_id IN
(
SELECT i_adgroup_id
FROM adgroupusers_br
WHERE i_user_id = 103713
)
GROUP BY i_adgroup_id;
Note that i_category_id
is no longer in the GROUP BY
as it is now being aggregated.
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