Using Limit on Delete SQL queries

Question

I had this query

DELETE c FROM review_comments AS c 
LEFT JOIN users AS u 
ON u.user_id = c.user_id
WHERE c.comment = '{$comment}'
AND u.username = '{$user}'
LIMIT 1;

It did not work until I removed LIMIT 1;

It said: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'LIMIT 1' at line 6

Is this the incorrect usage of LIMIT 1 in this instance? I had a same query without joining tables and LIMIT 1 worked fine?

Even if the syntax allowed it, it's questionable logic. If you want to delete a single record, you should be more specific about which record. — Dan Bracuk
– Dan Bracuk, Commented Feb 12, 2013 at 18:31
I think you should look into techniques for removing duplicate records, since this is what (if I understand correctly) you are essentially doing. — ron tornambe
– ron tornambe, Commented Feb 12, 2013 at 19:06
No my logic is not sound, it needs to be changed. I need to grab the 'comment_id', not the 'comment' AND 'user who made it'. It's a hack until I fix the bigger issue. — TheLettuceMaster
– TheLettuceMaster, Commented Feb 14, 2013 at 22:16

Rob Paller · Accepted Answer · 2013-02-12 18:17:18Z

4

I don't think LIMIT can be used with multi-table referenced DELETE statements in MySQL.

answered Feb 12, 2013 at 18:17

Rob Paller

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