请教一个查询语句的写法!
SELECT SUM(总计金额) AS Expr1 FROM 单位销售月统计表 WHERE (销售月份 = 1)
SELECT SUM(总计金额) AS Expr2 FROM 单位销售月统计表 WHERE (销售月份 = 2)
SELECT SUM(总计金额) AS Expr3 FROM 单位销售月统计表 WHERE (销售月份 = 3)
....
SELECT SUM(总计金额) AS Expr31 FROM 单位销售月统计表 WHERE (销售月份 = 31)
这些语句能不能简单点一条语句查询出来。我现在要31条才可以。