问题详情

Which of the following SQL statements will return the year and average salary for all employees hired within a given year that have a salary greater than $30,000?（）

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)

时间：2022-01-10 18:26 关键词： IBM(000-730)

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