I can't skip the ordering.
I'm sure aqjs3 is the one that produces the duplication.
I guess subqueries are the only option, like this:
SELECT atjs.id, tmp.children AS children
FROM administration.ad_query_join_select atjs
JOIN (SELECT
atjs.id, STRING_AGG(CAST(aqjs1.id AS VARCHAR), ',' ORDER BY
aqjs1.to_left) AS children
FROM administration.ad_query_join_select atjs
LEFT JOIN administration.ad_query_join_select aqjs1 ON
(aqjs1.id_ad_query = atjs.id_ad_query AND aqjs1.to_left>atjs.to_left
AND aqjs1.to_right<atjs.to_right)
LEFT JOIN administration.ad_query_join_select aqjs2 ON
(aqjs2.id_ad_query = atjs.id_ad_query AND aqjs2.to_left>atjs.to_left
AND aqjs2.to_right<atjs.to_right AND aqjs2.to_left<aqjs1.to_left AND
aqjs2.to_right>aqjs1.to_right)
WHERE aqjs2.id IS NULL AND atjs.id_ad_query = 475543
GROUP BY atjs.id) tmp ON (tmp.id = atjs.id)
JOIN administration.ad_query aq ON (aq.id=atjs.id_ad_query)
LEFT JOIN administration.ad_query_join_select aqjs3 ON
(aqjs3.id_ad_query = atjs.id_ad_query AND aqjs3.to_left<atjs.to_left
AND aqjs3.to_right>atjs.to_right)
WHERE atjs.id_ad_query = 475543
GROUP BY aq.id, atjs.id, tmp.children
ORDER BY aq.id ASC, atjs.to_left ASC;
Result is:
id ; children
1399029;"1399031"
1399031;"1399032,1399033"
Is there a better way? I usualy try to avoid subqueries.
------ Original Message ------
From: "Geoff Winkless" <pgsqlad...@geoff.dj>
To: "Sterpu Victor" <vic...@caido.ro>
Cc: "PostgreSQL General" <pgsql-general@postgresql.org>
Sent: 11/29/2015 6:42:18 PM
Subject: Re: [GENERAL] DISTINCT in STRING_AGG
On 28 November 2015 at 18:35, Sterpu Victor <vic...@caido.ro> wrote:
Can I make a distinct STRING_AGG?
This is my query :
SELECT atjs.id, STRING_AGG(CAST(aqjs1.id AS VARCHAR), ',' ORDER BY
aqjs1.to_left) AS children
FROM administration.ad_query_join_select atjs
JOIN administration.ad_query aq ON (aq.id=atjs.id_ad_query)
LEFT JOIN administration.ad_query_join_select aqjs1 ON
(aqjs1.id_ad_query = atjs.id_ad_query AND aqjs1.to_left>atjs.to_left
AND aqjs1.to_right<atjs.to_right)
LEFT JOIN administration.ad_query_join_select aqjs2 ON
(aqjs2.id_ad_query = atjs.id_ad_query AND aqjs2.to_left>atjs.to_left
AND aqjs2.to_right<atjs.to_right AND aqjs2.to_left<aqjs1.to_left AND
aqjs2.to_right>aqjs1.to_right)
LEFT JOIN administration.ad_query_join_select aqjs3 ON
(aqjs3.id_ad_query = atjs.id_ad_query AND aqjs3.to_left<atjs.to_left
AND aqjs3.to_right>atjs.to_right)
WHERE aqjs2.id IS NULL AND atjs.id_ad_query = 475543
GROUP BY aq.id, atjs.id
ORDER BY aq.id ASC, atjs.to_left ASC;
And "childen" contain doubles. The result is:
id ; children
1399029;"1399031,1399031"
1399031;"1399032,1399032,1399032,1399033,1399033,1399033"
There are doubles because of the join aqjs3 witch is producing this
problem.
Can I make it so the children ID's are unique?
Well if you can live with losing the to_left ordering, then you could
just do
SELECT STRING_AGG(DISTINCT CAST(aqjs1.id AS VARCHAR), '') AS children
...
no?
Geoff
