單項(xiàng)選擇題正則表達(dá)式的轉(zhuǎn)義符是()

A.\\
B.\
C.;
D.$$


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1.單項(xiàng)選擇題以下哪項(xiàng)屬于DDL操作()

A.update
B.create
C.insert
D.delete

2.單項(xiàng)選擇題按照姓名升序序排列()

A.ORDER BY NAME ASC
B.ORDER BY ASC NAME
C.ORDER BY NAME DESC
D.ORDER BY DESC NAME

3.單項(xiàng)選擇題以下哪項(xiàng)是不屬于DML操作()

A.insert
B.update
C.delete
D.create

5.單項(xiàng)選擇題返回字符串長(zhǎng)度的函數(shù)是()

A.len()
B.length()
C.left()
D.long()