Re: DISTINCT in STRING_AGG - Mailing list pgsql-general

From Sterpu Victor
Subject Re: DISTINCT in STRING_AGG
Date
Msg-id em4d0ac09d-8561-4b98-bb71-e252152fae29@victor-pc
Whole thread Raw
In response to Re: DISTINCT in STRING_AGG  (Geoff Winkless <pgsqladmin@geoff.dj>)
Responses Re: DISTINCT in STRING_AGG
List pgsql-general
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" <pgsqladmin@geoff.dj>
To: "Sterpu Victor" <victor@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 <victor@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​


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