MySQL IN clause: max number of arguments

Question

Say you have the following query:

SELECT * FROM table1 WHERE table1.id IN (1, 2, 3, 4, 5, ..., 999999)

What is a reasonable maximum for the

Answer 1

MariaDB (10.3.22 in my case) has a limit of 999 parameters to IN() before it creates a materialized temporary table, resulting in possibly much longer execution times. Depending on your indices. I haven't found a way to control this behaviour. MySQL 5.6.27 does not have this limit, at least not at ~1000 parameters. MySQL 5.7 might very well have the same "feature".

I ended up doing a series of where id = a or id = b ... but it also works fine by using series of where id in(a, b) or id in(c, d) ....