sql多表联查实例 下面提供四款sql多表关联查询的实例，个个效率不一样。select from order_info as a ,ivrlog4ivrdlvinst as b where (a.saleorder=b.ext1_skill and b.start_date=@date1 and se_id='55'and...
楼主使用的是子查询，子查询局限性较大，只能显示第一张表的字段。你可以这样写 SELECT * FROM biz.coursecomment a,so.sodetail b,so.somaster c where a.sono=b.sono and b.sono=c.sono and c.TeacherNO='10...
select LineId,Id,Country from Domestic union allselect LineId,Id,Country from Freedom-- 联合查询Domestic,Freedom表的LineId,Id,Country all代表不去除重复--功能：[SQL语句] UNION [
select a.sale,sum(a.total)from tsalsaleplu200805 a ,tsalsale200805 b where a.sale=b.sale and b.jzdat < '2008-05-01'group by a.sale --- 很久没有写sqlserver的脚本了，不知道时间比较格式对不对 a...
