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According to the documentation for the MySQL IN function: The number of values in the IN() list is only limited by the max_allowed_packet value. The default value for it is 67108864. So, you...
Answer
#1: Initial revision
by
Alexei
·
2020-11-13T18:59:21Z (over 3 years ago)
According to [the documentation for the MySQL IN function](https://dev.mysql.com/doc/refman/8.0/en/comparison-operators.html#function_in): > The number of values in the IN() list is only limited by the max_allowed_packet value. The default value for it is [67108864](https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_max_allowed_packet). So, you should be able to squeeze quite a big number of identifiers, but you should definitely try it out to see how it behaves under a normal server load. I am not sure how MySQL sees such queries though (I only have experience with such queries in MSSQL where it can [complain that they are too complex](https://stackoverflow.com/a/21179253/2780791)).