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单选题
对由SELECT--FROM—WHERE—GROUP--ORDER组成的SQL语句，其在被DBMS处理时，各子句的执行次序为（）
A
SELECT—FROM—GROUP—WHERE—ORDER
B
FROM--WHERE——GROUP——ORDER——SELECT
C
FROM——WHERE——GROUP——SELECT——ORDER
D
SELECT——FROM——WHERE——GROUP——ORDER
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单选题In a SELECT statement that includes a WHERE clause, where is the GROUP BY clause placed in the SELECT statement?（）A
Immediately after the SELECT clauseB
Before the WHERE clauseC
Before the FROM clauseD
After the ORDER BY clauseE
After the WHERE clause
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