What is faster in MySQL? WHERE sub request = 0 or IN list

Posted by Nicolas Manzini on Stack Overflow See other posts from Stack Overflow or by Nicolas Manzini
Published on 2012-06-04T10:36:24Z Indexed on 2012/06/04 10:41 UTC
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mysql

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Hello I was wondering what is better in MySQL.

I have a SELECT querry that exclude every entry associated to a banned userID

currently I have a subquerry clause in the WHERE statement that goes like

AND (SELECT COUNT(*) FROM TheBlackListTable WHERE userID = userList.ID AND blackListedID = :userID2 ) = 0

Which will accept every userID not present in the TheBlackListTable

Would it be faster to retrieve first all Banned ID in a previous request and replace the previous clause by

AND creatorID NOT IN listOfBannedID

Thank you!

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