Re: Update two tables returning id from insert CTE Query - Mailing list pgsql-general

2016-09-28 8:54 GMT+13:00 David G. Johnston <david.g.johnston@gmail.com>:

On Mon, Sep 26, 2016 at 9:06 PM, Patrick B <patrickbakerbr@gmail.com> wrote:

 

I'm doing this now:

 

 

sel AS (
SELECT i.id AS c_id
FROM (select id, row_number() OVER (ORDER BY id) AS rn FROM ins_table_1) i
JOIN rows s USING (rn)
)
UPDATE table_2 SET c_id = 
(
  SELECT c_id
  FROM sel
  ORDER BY c_id
) 
WHERE clientid = 124312;

 

But I get ERROR:  more than one row returned by a subquery used as an expression

 

 

​And this surprises you why?

 

I'd advise you get whatever it is you are trying to accomplish working using multiple queries in a transaction, probably with the help of temporary tables, then post that self-contained working example and ask for suggestions on how to turn it into a single query using CTEs (if its ever worth the effort at that point).

 

David J.​