HAVING 子句
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mysql> SELECT shohin_bunrui,COUNT(*) FROM Shohin GROUP BY shohin_bunrui HAVING COUNT(*)=2;
SELECT shohin_bunrui ,COUNT(*) FROM Shohin GROUP BY shohin_bunrui;
SELECT shohin_bunrui,COUNT(*) FROM Shohin GROUP BY shohin_bunrui HAVING shohin_bunrui = '办公用品';
WHERE 行对应的条件
HAVING 组对应的条件
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