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I have a db of people ( < 400 total ), imported from another system. The IDs are like this
_200802190302239ILXNSL
I do queries and joins to other tables on that field
Because I’m lazy and ignorant about MySQL data types and performance, I just set it to Text.
What data type should I be using and what sort of index should I set on it for best performance?
varchar (or char, if they all have the same length).
http://dev.mysql.com/doc/refman/5.0/en/char.html