Delete records from Postgresql

Question

I need to delete records from one table based on inner join condition on other two tables, however query runs for ages.

DELETE FROM public.blacklist WHERE subject_id NOT IN(
SELECT DISTINCT a.id FROM public.subject a
INNER JOIN stg.blacklist_init b ON a.subject_id=b.customer_code);

Any ideas how to achieve this?

Thank you.

Barbaros Özhan · Accepted Answer · 2019-03-18 19:19:25Z

1

You can use NOT EXISTS instead of NOT IN, and I think you don't need a DISTINCT

DELETE FROM public.blacklist bl
 WHERE NOT EXISTS  (
                     SELECT 0 
                       FROM public.subject a
                      INNER JOIN stg.blacklist_init b 
                         ON a.subject_id=b.customer_code
                      WHERE a.id = bl.subject_id 
                     );

edited Mar 18, 2019 at 19:19

answered Mar 18, 2019 at 19:08

Barbaros Özhan

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