Question

I can use

select * from sent_txts s 
LEFT JOIN received_txts r ON s.msg_link_id = r.id 
WHERE r.action_id = 6;

top select matching rows,

How can I write a query to delete the matching rows on both sides?

Something like

delete sent_txts s 
LEFT JOIN received_txts r ON s.msg_link_id = r.id 
WHERE r.action_id = 6;

Answer 1

Disclaimer: I do not have access to a mysql database to test at the moment, but I think you can use:

delete s, r from send_txts s left join received_txts r on s.msg_link_id = r.id where r.action_id = 6;

See mysql’s delete documentation for more information. A better method might be to put a foreign key constraint from received_txts to sent, and cascade the delete.