This is very often "expected to work". Just search StackOverflow for FIND_IN_SET. Here are just three random hits: http://stackoverflow.com/questions/4037145/m

This is very often "expected to work". Just search StackOverflow for FIND_IN_SET. Here are just three random hits: http://stackoverflow.com/questions/4037145/mysql-how-to-select-rows-where-value-is-in-array http://stackoverflow.com/questions/4037145/mysql-how-to-sele... http://stackoverflow.com/questions/3946831/mysql-where-problem http://stackoverflow.com/questions/3946831/mysql-where-probl... http://stackoverflow.com/questions/3734161/mysql-select-where-a-in-field http://stackoverflow.com/questions/3734161/mysql-select-wher... None actually "blames" MySQL for that. The article just describes what comes to the beginning developer's mind first, and tells the correct way to do that.