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What is a WHERE clause used for?

Entry MySQL
Quick Answer WHERE filters rows before they are returned or affected. Only rows matching the condition are processed. Used with SELECT, UPDATE, and DELETE. Conditions: comparison (=, >, <, !=), logical (AND, OR, NOT), pattern (LIKE "%term%"), NULL checks (IS NULL, IS NOT NULL), ranges (BETWEEN x AND y), sets (IN (1,2,3)). WHERE runs before GROUP BY; use HAVING to filter after aggregation.

Answer

WHERE filters records based on conditions, allowing retrieval of only relevant rows.
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