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单选题
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)


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