mysql查詢語句where與having子句區別

Mysql查詢語句執行： SELECT selection_list /要查詢的列名稱/ FROM table_list /要查詢的表名稱/ WHERE condition /行條件/ GROUP BY grouping_columns /對結果分組/ HAVING condition /分組後的行條件/ ORDER BY sorting_columns /對結果排序/ LIMIT offset_

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