ACREATE VIEW v1AS SELECT类别,SUM(数量)FROM商品GROUP BY类别
BCREATE VIEW v1AS SELECT类别,COUNT(数量)FROM商品GROUP BY类别
CCREATE VIEW v1(类别,总数量)AS SELECT类别,SUM(数量)FROM商品GROUP BY类别
DCREATE VIEW v1(类别,总数量)AS SELECT类别,COUNT(数量)FROM商品GROU PBY类别
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