sql三个表怎么连接查询
@郗肾6803：求三表联合查询的SQL查询语句 -
萧佳13786884183…… 车讯语句:select username,psw from (a1 left join a2 on a1.a1_id=a2.a1_id) left join a3 on a1.a1_id=a3.a1_id 这样写: SELECT S.SName AS 姓名, CS.CourseName AS 课程, C.Score AS 成绩 FROM Students AS S INNER JOIN Score AS C ...
@郗肾6803：sql 三表连接查询 -
萧佳13786884183…… select student.stuno(学号),stuname(姓名),book.bookno(书号),count(amount),sum(price)as 应付 FROM student,book,bookorder where student.stuno=bookorder.stuno,book.bookno=bookorder.bookno group by stuno(学号) go
@郗肾6803：相同的表 怎么用sql语句做三表连查? -
萧佳13786884183…… 表可以自身和自身做连接,关键看连接条件.n张表进行连接,需要n-1个连接条件.所谓连接条件就是两张表中那个字段对应相等.你的问题需要把具体表结构以及需求给出,才能进行解决.理论上来说肯定可以实现.
@郗肾6803：SQL三个表之间的关联查询 -
萧佳13786884183…… 1. select SIMNumber,DeviceID,SlotIndex from dbo.Card a,dbo.Forbid b where b.ProjectCode=a.id; 2. select SIMNumber,DeviceID,SlotIndex,DeviceName from dbo.Card a,dbo.Forbid b,Device c where b.ProjectCode=a.id and c.ID=a.ID;
@郗肾6803：一个3表的sqlserver连接查询怎么写 -
萧佳13786884183…… select a.aid,a.aname,b.Bnum,c.Cstr from a,b,c where a.aid=b.aid and a.aid=c.aid---- 或者你要的是 select aid,aname from a union all select aid,bnum from b union all select aid,cstr from c;
@郗肾6803：SQL 三个表如何相连?请给代码,谢谢 -
萧佳13786884183…… select * from 表1 join 表2 on 表1.a=表2.b join 表3 on 表1.c=表3.d
@郗肾6803：用SQL语句怎么查询三个表的结果 -
萧佳13786884183…… select table_a.D,table_a.E,table_b.F (select A.D as D,sum(B.E) as E from A,B where A.D=B.D group by A.D) table_a, (select A.D as D,sum(C.F) as F from A,B where A.D=C.D group by A.D) table_b where table_a.D=table_b.D
@郗肾6803：sql 3个表的连接查询 -
萧佳13786884183…… select ml.ml_id,ml.ml_name, dl.dl_name,jd.jd_name,ml.ml_date from ml left join dl on ml.dl_id=dl.dl_id left join jd on ml.jd_id=jd.jd_id
@郗肾6803：怎么用一句sql查询三个表并输出三个表的内容 -
萧佳13786884183…… select table1.id,table1.title,table1.content ,table1.s_time from table1 union select table2.id , table2.title_a , table2.content ,table2.time from table2 union select table3.id , table3.title , table3.content ,table3.time from table3 order by s_time 肯定正确啦^_^
@郗肾6803：sql server三张表之间的查询 -
萧佳13786884183…… select * from B right join A on B.userid=A.userid right join C on B.eqid=C.eqid 这个是以B表中的数据主主导,显示结果为所有的B表数据,对应的其他表的数据,如果有就显示,没有就显示为NLL
萧佳13786884183…… 车讯语句:select username,psw from (a1 left join a2 on a1.a1_id=a2.a1_id) left join a3 on a1.a1_id=a3.a1_id 这样写: SELECT S.SName AS 姓名, CS.CourseName AS 课程, C.Score AS 成绩 FROM Students AS S INNER JOIN Score AS C ...
@郗肾6803：sql 三表连接查询 -
萧佳13786884183…… select student.stuno(学号),stuname(姓名),book.bookno(书号),count(amount),sum(price)as 应付 FROM student,book,bookorder where student.stuno=bookorder.stuno,book.bookno=bookorder.bookno group by stuno(学号) go
@郗肾6803：相同的表 怎么用sql语句做三表连查? -
萧佳13786884183…… 表可以自身和自身做连接,关键看连接条件.n张表进行连接,需要n-1个连接条件.所谓连接条件就是两张表中那个字段对应相等.你的问题需要把具体表结构以及需求给出,才能进行解决.理论上来说肯定可以实现.
@郗肾6803：SQL三个表之间的关联查询 -
萧佳13786884183…… 1. select SIMNumber,DeviceID,SlotIndex from dbo.Card a,dbo.Forbid b where b.ProjectCode=a.id; 2. select SIMNumber,DeviceID,SlotIndex,DeviceName from dbo.Card a,dbo.Forbid b,Device c where b.ProjectCode=a.id and c.ID=a.ID;
@郗肾6803：一个3表的sqlserver连接查询怎么写 -
萧佳13786884183…… select a.aid,a.aname,b.Bnum,c.Cstr from a,b,c where a.aid=b.aid and a.aid=c.aid---- 或者你要的是 select aid,aname from a union all select aid,bnum from b union all select aid,cstr from c;
@郗肾6803：SQL 三个表如何相连?请给代码,谢谢 -
萧佳13786884183…… select * from 表1 join 表2 on 表1.a=表2.b join 表3 on 表1.c=表3.d
@郗肾6803：用SQL语句怎么查询三个表的结果 -
萧佳13786884183…… select table_a.D,table_a.E,table_b.F (select A.D as D,sum(B.E) as E from A,B where A.D=B.D group by A.D) table_a, (select A.D as D,sum(C.F) as F from A,B where A.D=C.D group by A.D) table_b where table_a.D=table_b.D
@郗肾6803：sql 3个表的连接查询 -
萧佳13786884183…… select ml.ml_id,ml.ml_name, dl.dl_name,jd.jd_name,ml.ml_date from ml left join dl on ml.dl_id=dl.dl_id left join jd on ml.jd_id=jd.jd_id
@郗肾6803：怎么用一句sql查询三个表并输出三个表的内容 -
萧佳13786884183…… select table1.id,table1.title,table1.content ,table1.s_time from table1 union select table2.id , table2.title_a , table2.content ,table2.time from table2 union select table3.id , table3.title , table3.content ,table3.time from table3 order by s_time 肯定正确啦^_^
@郗肾6803：sql server三张表之间的查询 -
萧佳13786884183…… select * from B right join A on B.userid=A.userid right join C on B.eqid=C.eqid 这个是以B表中的数据主主导,显示结果为所有的B表数据,对应的其他表的数据,如果有就显示,没有就显示为NLL
