A.1 B.2 C.255 D.任意長(zhǎng)度的字符串
A.asc B.desc C.between D.in
A.select列別名=原列名from數(shù)據(jù)源 B.select原列名as列別名from數(shù)據(jù)源 C.select原列名列別名from數(shù)據(jù)源 D.select原列名to列別名from數(shù)據(jù)源