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?（）ASELECT * FROM t1 UNION SELECT * FROM t2BSELECT * FROM t1 UNION DISTINCT SELECT * FROM t2CSELECT * FROM t1 INTERSECT SELECT * FROM t2DSELECT * FROM t1 WHERE (c1,c2)= (SELECT c1,c2 FROM t2)
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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