Re: Looping (cursor) in SP giving performance delays

[Peter Brawley]

Cursors process one row at a time, so they're s-l-o-w ... for a bit ofdiscussion on the matter see "A cursor if necessary, but not necessarily a cursor" at https://www.artfulsoftware.com/queries.php.

For the sort of problem you describe, a speedy query is usually possible. But guess isn't sufficient, instead let's see your MySQL version, the Show Create table results for each involved table, and the no. of rows in each table, so we can design an optimised solution.