sql一对多查询
梁软乐1062SQL 在一对多的表格中执行多表查询,我不想内容重复,凡是一对多的我都取第一个值,我该怎么写. -
荀怕单19518807714 ______ select a.id , ---或者其他个人信息 count(d.xx_id),--应有考勤数量 sum(nvl(d.countid,0)) --实际考勤数量 from a , (select b.xx_id,count(c.id) countid from b,c where b.id = c.kj_id(+) group by b.xx_id ) d where a.id = xx_id(+) group by a.id 以上为oracle写法(+)表示外关联.
梁软乐1062sql 一对多 子表多条件查询 -
荀怕单19518807714 ______ SELECT * FROM product WHERE EXISTS ( SELECT 1 FROM Proattr WHERE Proattr.rid = product.rid AND Proattr.TypeID = 1) AND EXISTS ( SELECT 1 FROM Proattr WHERE Proattr.rid = product.rid AND Proattr.TypeID = 2)
梁软乐1062一对多 子表条件查询 请sql 高手帮忙 -
荀怕单19518807714 ______ declare @a1 table(value varchar(10)) insert into @a1 select 'a1' union all select 'a2' declare @a2 table(value varchar(10)) insert into @a2 select 'a1b1' union all select 'a1b2' union all select 'a1b3' union all select 'a2b1' union all select 'a2b2' union all...
梁软乐1062求一个一对多汇总的sql句子 -
荀怕单19518807714 ______ --#1.根据业务逻辑,可以用inner join来提高查询效率--#2.如果是sql server 2005及以上版本,用cross apply(outer apply),相当于inner join(left join) SELECT A.*, B.*, C.* FROM Class A CROSS APPLY(SELECT StudentID FROM Relation WHERE ClassID = A.id) B CROSS APPLY(SELECT totalMoney = SUM(Money) FROM Student WHERE id = B.StudentID) C WHERE A.[Name] = '三年一班'
梁软乐1062请教sql语句,多表查询一对多分页 -
荀怕单19518807714 ______ 我只想到用子查询 select top 10 *,(select count(1) from userTable )as 'count' from userTable但这样总记录会查10次我想要只查1次count(*) ,然后添加到记录集的最后一列的第一行或者 能在sql语句中添加output参数吗?我用的java回答:你如果...
梁软乐1062两张表的sql一对多的查询语句 怎么写啊? -
荀怕单19518807714 ______ select keyvalue as typeid , name from B where id ='typeid' and keyvalue in (select typeid from A)
梁软乐1062SQLServer两张表联合查询(一对多)... -
荀怕单19518807714 ______ select t1.U_Id,t1.U_Name,sum(isnull(t2.G_Price,0)) as G_Price from Users t1 left join Goods t2 on t1.U_Id=t2.G_UId group by t1.U_Id,t1.U_Name order by t1.U_Id
梁软乐1062sql 一对多查询 -
荀怕单19518807714 ______ http://hi.baidu.com/xckouy/blog/item/acb9196b010f60e142169409.html 方法二 http://hi.baidu.com/xckouy/blog/item/59f80adb342eaec38c10293f.html 处理多行转一行,使用动态会更简单点!--参照下列处理成绩表(可以有问题),再联合学生表...
梁软乐1062sql server 多对一查询 -
荀怕单19518807714 ______ 假设你的表名是yao,查询如下 select a.id,a.ym from yao a join ( select id ,min(len(ym)) as zd from yao group by id) b on a.id = b.id where len(a.ym) = b.zd
梁软乐1062sql 语句 多表关联查询 -
荀怕单19518807714 ______ 假设a(a1,a2,a3,a4);b(b1,ba1,b3,b4);c(c1,c2,c3);d(d1,d2,d3) select a.*,b.*,c.*,d.* from a join b on a.a1=b.ba1 join c on c.c1=b.a1 join d on b.id =d.id and a.a1=b.ba1