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I maintain a website where users post interesting links, and other users leave replies under the said links. I want to delete aged link entries under which no one replied.

The postgresql database is like so: there's a table called links_link, and another one called links_publicreply. links_publicreply has a column called answer_to, which is a foreign key to links_link. I only want to delete aged rows in links_link which do NOT have a related entry in links_publicreply.

What would the queries be? Something like the following?

begin;
DELETE FROM links_link WHERE id NOT IN links_publicreply AND "submitted_on" < now() - interval('1 day'); 
commit;

I don't want to run into foreign key violations.

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Use a subrequest : this should work

DELETE FROM links_link WHERE id NOT IN (select answer_to from links_publicreply ) AND `submitted_on` < CURRENT_DATE-1 ;

You can have of course multiple subrequest chained.

| improve this answer | |
  • Hmm, so I tried DELETE FROM links_link WHERE id NOT IN (select "answer_to" from links_publicreply) AND "submitted_on" < now() - interval '1 hour'; which is more or less what you suggested, but I'm getting the error: current transaction is aborted, commands ignored until end of transaction block. Any ideas? – Hassan Baig Mar 1 '16 at 14:30
  • Did you run it in a begin / commit ? or just directly ? – error500 Mar 1 '16 at 23:21
  • I ran it in begin / commit, out of habit. – Hassan Baig Mar 1 '16 at 23:24
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    You should have a look at this so laurenthinoul.com/… – error500 Mar 2 '16 at 12:08

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