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EXPLAIN - The Best And Worst Tool For Speeding Up SQL Queries
Dave Stokes
Structured Query Language can be tricky. The main tool that is used to check query performance is EXPLAIN. EXPLAIN is beyond tricky, having its own little quirks and foibles. This is an introductory session into its use with MySQL and PostgreSQL where you will learn to decipher what EXPLAIN is trying to tell you. EXPLAIN is a handy tool once you learn how to read the entrails.
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