如题

SELECT SUM(工资)/COUNT(工资) as 平均 FROM  表1 WHERE 职称="初级" GROUP BY 职称 INTO CURSOR a1
SELECT SUM(工资)/COUNT(工资) as 平均 FROM  表1 WHERE 职称="中级" GROUP BY 职称 INTO CURSOR a2
? a1.平均-a2.平均