A.The CONNECT statement B.The first FETCH of a cursor C.The BEGIN TRANSACTION statement D.The first executable SQL statement
Given that tables T1 and T2 contain the following rows: Table T1: C1 C2 1 4 1 3 1 2 Table T2: C1 C2 1 1 1 2 1 3 Which of the following queries will return only those rows that exist in both T1 and T2?（）
A.SELECT * FROM t1 UNION SELECT * FROM t2 B.SELECT * FROM t1 UNION DISTINCT SELECT * FROM t2 C.SELECT * FROM t1 INTERSECT SELECT * FROM t2 D.SELECT * FROM t1 WHERE (c1,c2)= (SELECT c1,c2 FROM t2)
A.Row B.Table C.Scalar D.Column
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