关于多表合并连接查询，如何去掉重复的结果？

[rideyou]

例如：
表A
ih hc date
1 Q1 2007-1-1
1 Q1 2007-2-1
2 Q2 2007-1-5
3 Q3 2007-3-1

表B
ih idx jg
1 1 10.2
1 2 10.3
1 3 9.8
2 1 11
2 2 10.2
3 2 12

想要的结果：
ih hc date jg
1 Q1 2007-1-1 10.2
2007-2-1 10.3
9.8
2 Q2 2007-1-5 11
10.2
3 Q3 2007-3-1 12

如何实现？谢谢，在线等！

[dobear_0922]

select A.*, B.jg
from A left join (select ih, jg=min(jg) from B group by ih) B
   on A.ih=B.ih 

[dobear_0922]

晕，看错了

[yrwx001]

select isnull(A.ih,''),isnull(A.hc,''),isnull(A.date,''),B.jg
from B left join A on B.ih = A.ih and B.idx = month(A.date)

[fcuandy]

要求不明确。
ta中ih=1的2条记录,tb中ih=1的记录3条,join 出来6条。
idx=1的tb行与ih=1的ta的首行对应，
ih=1的tb行的其它行就与ih=1的第二行对应呢?
如果将这看成规定也可以，
那tb的idx=1的行对应到ta中同ih的首行，
其它行对应到ta中同ih的第二行。

那么ta中同ih的行有三行呢？又怎么取?

逻辑不明,不做回答

[samfeng_2003]

CREATE TABLE T1
(
 ih INT,
 hc VARCHAR(20),
 date VARCHAR(20)
)

INSERT INTO T1
SELECT 1,'Q1','2007-1-1' UNION ALL 
SELECT 1,'Q1','2007-2-1' UNION ALL  
SELECT 2,'Q2','2007-1-5' UNION ALL  
SELECT 3,'Q3','2007-3-1'

CREATE TABLE T2
(ih INT,
 idx INT,
 jg DECIMAL(10,2)
)
INSERT INTO T2 
SELECT 1,1,10.2 UNION ALL 
SELECT 1,2,10.3 UNION ALL 
SELECT 1,3,9.8 UNION ALL 
SELECT 2,1,11 UNION ALL 
SELECT 2,2,10.2 UNION ALL 
SELECT 3,2,12 

  SELECT A.ih,A.hc,A.date,B.jg
    FROM
     (
      SELECT ID = (SELECT COUNT(1) FROM T1 WHERE A.ih = ih AND date<=a.date),*
        FROM T1 A
     ) A 
      RIGHT JOIN 
      (
       SELECT ID = (SELECT COUNT(1) FROM T2 WHERE A.ih = ih AND idx<=a.idx),*
        FROM T2 A
      ) B ON A.ID = B.ID AND A.ih = B.ih


DROP TABLE T1,T2

ih          hc                   date                 jg           
----------- -------------------- -------------------- ------------ 
1           Q1                   2007-1-1             10.20
1           Q1                   2007-2-1             10.30
NULL        NULL                 NULL                 9.80
2           Q2                   2007-1-5             11.00
NULL        NULL                 NULL                 10.20
3           Q3                   2007-3-1             12.00

（所影响的行数为 6 行）

[dawugui]

create table A(ih varchar(10),hc varchar(10),date varchar(10))
insert into A values('1', 'Q1', '2007-01-01') 
insert into A values('1', 'Q1', '2007-02-01') 
insert into A values('2', 'Q2', '2007-01-05') 
insert into A values('3', 'Q3', '2007-03-01')
create table B(ih varchar(10),idx int,jg decimal(18,1))
insert into B values('1', 1, 10.2) 
insert into B values('1', 2, 10.3) 
insert into B values('1', 3, 9.8 )
insert into B values('2', 1, 11 )
insert into B values('2', 2, 10.2) 
insert into B values('3', 2, 12 ) 
go

select 
  ih = case when idx=(select min(idx) from 
  (
    select t1.* , b.idx,b.jg from (select t.* from a t where date = (select min(date) from a where ih = t.ih)) t1,b where t1.ih = b.ih
  ) m1
  where m4.ih=m1.ih) then ih else '' end ,
  hc = case when idx=(select min(idx) from 
  (
    select t1.* , b.idx,b.jg from (select t.* from a t where date = (select min(date) from a where ih = t.ih)) t1,b where t1.ih = b.ih
  ) m2
  where m4.ih=m2.ih) then hc else '' end ,
  date = case when idx=(select min(idx) from 
  (
    select t1.* , b.idx,b.jg from (select t.* from a t where date = (select min(date) from a where ih = t.ih)) t1,b where t1.ih = b.ih
  ) m3
  where m4.ih=m3.ih) then date else '' end ,
  jg
  from 
  (
    select t1.* , b.idx,b.jg from (select t.* from a t where date = (select min(date) from a where ih = t.ih)) t1,b where t1.ih = b.ih
  ) m4

drop table A,B

/*
ih         hc         date       jg                   
---------- ---------- ---------- -------------------- 
1          Q1         2007-01-01 10.2
                                 10.3
                                 9.8
2          Q2         2007-01-05 11.0
                                 10.2
3          Q3         2007-03-01 12.0

（所影响的行数为 6 行）
*/

[dawugui]

create table A(ih int,hc varchar(10),date datetime)
insert into A values(1, 'Q1', '2007-1-1') 
insert into A values(1, 'Q1', '2007-2-1') 
insert into A values(2, 'Q2', '2007-1-5') 
insert into A values(3, 'Q3', '2007-3-1')
create table B(ih int,idx int,jg decimal(18,1))
insert into B values(1, 1, 10.2) 
insert into B values(1, 2, 10.3) 
insert into B values(1, 3, 9.8 )
insert into B values(2, 1, 11 )
insert into B values(2, 2, 10.2) 
insert into B values(3, 2, 12 ) 
go

select 
  ih = case when idx=(select min(idx) from 
  (
    select t1.* , b.idx,b.jg from (select t.* from a t where date = (select min(date) from a where ih = t.ih)) t1,b where t1.ih = b.ih
  ) m1
  where m4.ih=m1.ih) then cast(ih as varchar) else '' end ,
  hc = case when idx=(select min(idx) from 
  (
    select t1.* , b.idx,b.jg from (select t.* from a t where date = (select min(date) from a where ih = t.ih)) t1,b where t1.ih = b.ih
  ) m2
  where m4.ih=m2.ih) then hc else '' end ,
  date = case when idx=(select min(idx) from 
  (
    select t1.* , b.idx,b.jg from (select t.* from a t where date = (select min(date) from a where ih = t.ih)) t1,b where t1.ih = b.ih
  ) m3
  where m4.ih=m3.ih) then convert(varchar(10),date,120) else '' end ,
  jg
  from 
  (
    select t1.* , b.idx,b.jg from (select t.* from a t where date = (select min(date) from a where ih = t.ih)) t1,b where t1.ih = b.ih
  ) m4

drop table A,B

/*
ih                             hc         date       jg                   
------------------------------ ---------- ---------- -------------------- 
1                              Q1         2007-01-01 10.2
                                                     10.3
                                                     9.8
2                              Q2         2007-01-05 11.0
                                                     10.2
3                              Q3         2007-03-01 12.0

（所影响的行数为 6 行）
*/

[samfeng_2003]

CREATE TABLE T1
(
 ih INT,
 hc VARCHAR(20),
 date VARCHAR(20)
)

INSERT INTO T1
SELECT 1,'Q1','2007-1-1' UNION ALL 
SELECT 1,'Q1','2007-2-1' UNION ALL  
SELECT 2,'Q2','2007-1-5' UNION ALL  
SELECT 3,'Q3','2007-3-1'

CREATE TABLE T2
(ih INT,
 idx INT,
 jg DECIMAL(10,2)
)
INSERT INTO T2 
SELECT 1,1,10.2 UNION ALL 
SELECT 1,2,10.3 UNION ALL 
SELECT 1,3,9.8 UNION ALL 
SELECT 2,1,11 UNION ALL 
SELECT 2,2,10.2 UNION ALL 
SELECT 3,2,12 

  SELECT ih= CASE WHEN B.ID >= 2 THEN '' ELSE CAST(A.ih AS VARCHAR) END
         ,hc=CASE WHEN B.ID >= 2 THEN '' ELSE ISNULL(A.hc,'') END,
          DATE = CASE WHEN 
                      (SELECT DATE FROM
                        (      
                        SELECT ID = (SELECT COUNT(1) FROM T1 WHERE A.ih = ih AND date<=a.date),*
                        FROM T1 A
                        ) M 
                         WHERE M.ID-1 = A.ID) = A.DATE
                      THEN ''
                      ELSE ISNULL(A.DATE,'')
                      END,
         B.jg 
    FROM
     (
      SELECT ID = (SELECT COUNT(1) FROM T1 WHERE A.ih = ih AND date<=a.date),*
        FROM T1 A
     ) A 
      RIGHT JOIN 
      (
       SELECT ID = (SELECT COUNT(1) FROM T2 WHERE A.ih = ih AND idx<=a.idx),*
        FROM T2 A
      ) B ON A.ID = B.ID AND A.ih = B.ih


DROP TABLE T1,T2

ih                             hc                   DATE                 jg           
------------------------------ -------------------- -------------------- ------------ 
1                              Q1                   2007-1-1             10.20
                                                    2007-2-1             10.30
                                                                         9.80
2                              Q2                   2007-1-5             11.00
                                                                         10.20
3                              Q3                   2007-3-1             12.00

（所影响的行数为 6 行）

[samfeng_2003]

--少了个条件

  SELECT ih= CASE WHEN B.ID >= 2 THEN '' ELSE CAST(A.ih AS VARCHAR) END
         ,hc=CASE WHEN B.ID >= 2 THEN '' ELSE ISNULL(A.hc,'') END,
          DATE = CASE WHEN 
                      (SELECT DATE FROM
                        (      
                        SELECT ID = (SELECT COUNT(1) FROM T1 WHERE A.ih = ih AND date<=a.date),*
                        FROM T1 A
                        ) M 
                         WHERE M.ID-1 = A.ID AND A.ih = M.ih ) = A.DATE
                      THEN ''
                      ELSE ISNULL(A.DATE,'')
                      END,
         B.jg 
    FROM
     (
      SELECT ID = (SELECT COUNT(1) FROM T1 WHERE A.ih = ih AND date<=a.date),*
        FROM T1 A
     ) A 
      RIGHT JOIN 
      (
       SELECT ID = (SELECT COUNT(1) FROM T2 WHERE A.ih = ih AND idx<=a.idx),*
        FROM T2 A
      ) B ON A.ID = B.ID AND A.ih = B.ih

[rideyou]

谢谢各位，我先把这个帖子结了，我把实际的表结构及数据发到另一个贴子里，希望大家帮忙分析解决！