在SQL Server 2000中，在表STUDENT中按NL平均值和CJ总分统计查，则SQL语句为______
A．SELECT "统计" AS 类别,MIN (NL) AS 平均年龄,SUM (CJ) AS 总分 FROM STUDENT1 B．SELECT "统计" AS 类别,AVG (NL) AS 平均年龄,SUM (CJ) AS 总分 FROM STUDENT1 C．SELECT "统计" AS 类别,AVG (NL) AS 平均年龄,MAX (CJ) AS 总分 FROM STUDENT1 D．SELECT "统计" AS 类别,COUNT (NL) AS 平均年龄,SUM (CJ) AS 总分 FROM STUDENT1