MySQL EXPLAIN is a command used to analyze and optimize SELECT statements in MySQL. The EXPLAIN statement provides information about how MySQL executes the query, including which indexes are used, the order of table joins, and the estimated number of rows that will be examined. This information can help identify performance issues with a query and suggest ways to improve it. The output of EXPLAIN can be interpreted using various optimization techniques such as adding indexes, optimizing queries or reorganizing tables. Overall, EXPLAIN is a useful tool for database administrators and developers who want to optimize their queries for better performance.
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