mysql-求助，联合查询多次求和同一张表同一字段,求和结果总是不对:mysqlphp SELECT so.*,t1.时间 AS 最后记账时间,IFNULL(SUM(t1.金额),0) AS 总金额,IFNULL(SUM(金额),0) AS 定单金额,IFNULL(SUM(t3.金额),0) AS 销售单金额' .' FROM 订单表 AS so LEFT JOIN ' .'(SELECT ID,金