求零件P2的总供应量()
A.SELECTCOUNT(*)FROMSPWHEREPNO=’P2’;
B.SELECTCOUNT(QTY)FROMSPWHEREPNO=’P2’;
C.SELECTSUM(QTY)FROMSPLIKEPNO=P2;
D.SELECTSUM(QTY)FROMSPWHEREPNO=’P2’;
正确答案:D
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