Do you want to improve your application’s and database server’s performance? Remove useless queries. Yes, you probably have them.
Read moreSearching a phone book and copying names
Why developers need to learn the basics of query optimisation. How to make the learning process easy and pleasant.
Read moreMySQL: IS NULL conditions and indexes
It is quite common to use an equality condition and an IS NULL condition on the same columns. Unfortunately, this could make queries very slow.
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