30.查詢订单数在3个以上、订单的平均金额在200元以上的职员号。正确的SQL语句是
(A)SELECT 职员号 FROM 订单 GROUP BY 职员号 HAVING COUNT(*)>3 AND AVG_金额>200
(B)SELECT 职员号 FROM 订单 GROUP BY 职员号 HAVING COUNT(*)>3 AND AVG(金额)>200
(C)SELECT 职员号 FROM 订单 GROUP BY 职员号 HAVING COUNT(*)>3 WHERE AVG(金额)>200
(D)SELECT 职员号 FROM 订单 GROUP BY 职员号 WHERE COUNT(*)>3 AND AVG_金额>200
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