A.CREATE VIEW v1AS SELECT類別,SUM(數(shù)量)FROM商品GROUP BY類別
B.CREATE VIEW v1AS SELECT類別,COUNT(數(shù)量)FROM商品GROUP BY類別
C.CREATE VIEW v1(類別,總數(shù)量)AS SELECT類別,SUM(數(shù)量)FROM商品GROUP BY類別
D.CREATE VIEW v1(類別,總數(shù)量)AS SELECT類別,COUNT(數(shù)量)FROM商品GROU PBY類別