⚡ Optimizer Tips

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📖 SQL Keyword Quick Reference

SELECT Retrieve data from tables

JOIN Combine rows from two+ tables

WHERE Filter rows by condition

GROUP BY Aggregate rows by column

HAVING Filter grouped results

ORDER BY Sort result set

INDEX Speed up lookups on columns

EXPLAIN Show query execution plan

UNION Combine results of two queries

SUBQUERY Nested query within a query

CTE Common Table Expression (WITH)

LIMIT Restrict number of rows returned