HiWhy "list(x.tbl2_pk_id)"?Result of list is a blob string with one single value like '1,2,3' not a 3 records '1', '2', '3'.And using "in" is not a good choice here. Change query to e.g. 'exists' or better some 'join'Regards,Karol Bieniaszewski null
RE: [firebird-support] Plan problem en CTE
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