Question

我加入2个表但使用3个表。我不需要重复值。但我尝试加入有重复。

表peopleAll：

pNo    pName
-------------
00001  Sang
00002  Janta
00003  Els
00004  Est
00005  Sam
00006  John
00007  Misan
00008  Wila
00009  light
00010  Smith
00011  Ritpo

表fTime：

cNo    cDate                     cIn                        cOut
-----------------------------------------------------------------------------------
00001  2012-10-22 00:00:00.000   2012-10-22 07:59:00.000    2012-10-22 20:34:00.000
00002  2012-10-22 00:00:00.000   2012-10-22 12:50:00.000    2012-10-22 19:50:00.000
00003  2012-10-22 00:00:00.000   2012-10-22 12:01:00.000    2012-10-22 20:30:00.000
00004  2012-10-22 00:00:00.000   2012-10-22 07:55:00.000    2012-10-22 20:30:00.000
00005  2012-10-22 00:00:00.000   2012-10-22 07:27:00.000    2012-10-22 20:31:00.000
00010  2012-10-22 00:00:00.000   2012-10-22 07:12:00.000    2012-10-22 20:22:00.000

表Leave：

lNo    lDate                     lStart                     lStop
-----------------------------------------------------------------------------------
00002  2012-10-22 00:00:00.000   2012-10-22 08:00:00.000    2012-10-22 12:00:00.000
00003  2012-10-22 00:00:00.000   2012-10-22 08:00:00.000    2012-10-22 12:00:00.000
00011  2012-10-22 00:00:00.000   NULL                       NULL

此SQL代码：

SELECT lr.lNo, lr.lDate, lr.lStart, lr.lStop 
FROM Leave lr 
Where lr.cStart = '2012-10-22'

UNION ALL

SELECT pa.pNo, ISNULL(tf.cDate, Convert(nvarchar(10),'2012-10-22',114)),tf.cIn, tf.cOut
FROM fTime tf FULL OUTER join peopleAll pa On tf.cNo = pa.pNo AND 
tf.cDate = Convert(nvarchar(10),'2012-10-22',114)

返回此输出：

lNo    lDate                     lStart                     lStop
-----------------------------------------------------------------------------------
00001  2012-10-22 00:00:00.000   2012-10-22 07:59:00.000    2012-10-22 20:34:00.000
00002  2012-10-22 00:00:00.000   2012-10-22 08:00:00.000    2012-10-22 12:00:00.000
00002  2012-10-22 00:00:00.000   2012-10-22 12:50:00.000    2012-10-22 19:50:00.000
00003  2012-10-22 00:00:00.000   2012-10-22 08:00:00.000    2012-10-22 12:00:00.000
00003  2012-10-22 00:00:00.000   2012-10-22 12:01:00.000    2012-10-22 20:30:00.000
00004  2012-10-22 00:00:00.000   2012-10-22 07:55:00.000    2012-10-22 20:30:00.000
00005  2012-10-22 00:00:00.000   2012-10-22 07:27:00.000    2012-10-22 20:31:00.000
00006  2012-10-22 00:00:00.000   NULL                       NULL
00007  2012-10-22 00:00:00.000   NULL                       NULL
00008  2012-10-22 00:00:00.000   NULL                       NULL
00009  2012-10-22 00:00:00.000   NULL                       NULL
00010  2012-10-22 00:00:00.000   2012-10-22 07:12:00.000    2012-10-22 20:22:00.000
00011  2012-10-22 00:00:00.000   NULL                       NULL

我尝试更改FULL OUTER JOIN然后更改LEFT OUTER JOIN并获得输出：

lNo    lDate                     lStart                     lStop
-----------------------------------------------------------------------------------
00002  2012-10-22 00:00:00.000   2012-10-22 08:00:00.000    2012-10-22 12:00:00.000
00002  2012-10-22 00:00:00.000   2012-10-22 12:50:00.000    2012-10-22 19:50:00.000
00003  2012-10-22 00:00:00.000   2012-10-22 08:00:00.000    2012-10-22 12:00:00.000
00003  2012-10-22 00:00:00.000   2012-10-22 12:01:00.000    2012-10-22 20:30:00.000
00004  2012-10-22 00:00:00.000   2012-10-22 07:55:00.000    2012-10-22 20:30:00.000
00007  2012-10-22 00:00:00.000   NULL                       NULL
00008  2012-10-22 00:00:00.000   NULL                       NULL
00010  2012-10-22 00:00:00.000   2012-10-22 07:12:00.000    2012-10-22 20:22:00.000
00011  2012-10-22 00:00:00.000   NULL                       NULL

左外连接错过了一些字段??

我需要这个输出：

lNo    lDate                     lStart                     lStop
-----------------------------------------------------------------------------------
00001  2012-10-22 00:00:00.000   2012-10-22 07:59:00.000    2012-10-22 20:34:00.000
00002  2012-10-22 00:00:00.000   2012-10-22 12:50:00.000    2012-10-22 19:50:00.000 
00003  2012-10-22 00:00:00.000   2012-10-22 12:01:00.000    2012-10-22 20:30:00.000
00004  2012-10-22 00:00:00.000   2012-10-22 07:55:00.000    2012-10-22 20:30:00.000
00005  2012-10-22 00:00:00.000   2012-10-22 07:27:00.000    2012-10-22 20:31:00.000
00006  2012-10-22 00:00:00.000   NULL                       NULL
00007  2012-10-22 00:00:00.000   NULL                       NULL
00008  2012-10-22 00:00:00.000   NULL                       NULL
00009  2012-10-22 00:00:00.000   NULL                       NULL
00010  2012-10-22 00:00:00.000   2012-10-22 07:12:00.000    2012-10-22 20:22:00.000
00011  2012-10-22 00:00:00.000   NULL                       NULL

(00002,00003 from fTime)

请帮帮我。谢谢你的时间。：）

Answer 1

Select p.pNo
,Coalesce(l.cDate,t.lDate,'2012-10-22') as ldate
,Coalesce(l.lStart,t.cIn) as lstart
,Coalesce(l.lStop,t.cOut  ) as lstop
from peopleall p
left join leave l on l.lNo=p.Pno and l.ldate='2012-10-22'
left join fTime t on t.tNo=p.Pno and t.cDate='2012-10-22'

Answer 2

试试这个

Select p.pNo , 
Coalesce(l.lDate , ftemp.cDate , NULL) as lDate , 
Coalesce(l.lStart,ftemp.cIn , NULL)  as lStart ,
Coalesce(l.lStop , ftemp.cOut, NULL ) as lStop 
from peopleAll p  
left join Leave l  on (p.pNo = l.lNo ) 
left join 
  (select cNo, cDate ,cIn, cOut 
     from  fTime ft where not exists (select 1 from Leave l2 
                                      where ft.cNo = l2.lNo )) 
     ftemp
on (ftemp.cNo = p.pNo )

如果你收到错误，你可以寄给我一下吗？

如何才能获得加入而不是重复？

2 个答案: