Answer / Mithilesh Kumar

A poorly performing SQL query can be optimized through various techniques such as: 1) Indexing the columns used in JOIN, WHERE, GROUP BY or ORDER BY clauses; 2) Reducing the number of subqueries and using joins instead; 3) Removing unnecessary fields in the SELECT statement; 4) Optimizing the query by rewriting it to avoid full table scans; 5) Using stored procedures or prepared statements; 6) Monitoring database statistics and configuring the database server for optimal performance.

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