在GroupBy期间，我只需要获得一个结果，但我得到重复

Question

这是一个容易理解我需要的例子 在下面的图片我已经把两个表数据，

表B中的

与tableA，

链接

来自tableA ID - ＆gt; 1在一个主题中失败

ID - ＆GT; 2是通过所有主题

ID - ＆GT; 3在2个科目中失败。

所以我需要像这样的确切结果

我使用的查询是

Select A.ID,A.name,case when B.Result='fail' then 'Fail' else 'Pass' End  from tableA A 
inner join
TableB B ON B.id=A.Aid

使用此名称将重复。 ，但我只需要一个名字，只有一个结果

Answer 1

你想要的是在每个学生的成绩中得到最差的结果（如果有一个“失败”则“失败”，否则“通过”）。您可以使用$sort = function ($a, $b){ static $czechCharsS = array('Á', 'Č', 'Ď', 'É', 'Ě' , 'Ch' , 'Í', 'Ň', 'Ó', 'Ř', 'Š', 'Ť', 'Ú', 'Ů' , 'Ý', 'Ž', 'á', 'č', 'ď', 'é', 'ě' , 'ch' , 'í', 'ň', 'ó', 'ř', 'š', 'ť', 'ú', 'ů' , 'ý', 'ž'); static $czechCharsR = array('AZ','CZ','DZ','EZ','EZZ','HZZZ','IZ','NZ','OZ','RZ','SZ','TZ','UZ','UZZ','YZ','ZZ','az','cz','dz','ez','ezz','hzzz','iz','nz','oz','rz','sz','tz','uz','uzz','yz','zz'); $A = str_replace($czechCharsS, $czechCharsR, $a); $B = str_replace($czechCharsS, $czechCharsR, $b); return strnatcasecmp($A, $B); }; uasort($options, $sort); 和group by作为分组功能

min

这是有效的，因为按字母顺序排列Select A.ID, A.Name, min(B.Result) from TableA A join TableB B on A.ID = B.Aid group by A.ID, A.Name

Answer 2

;with TableA(Id,Name,Class)
As
(
SELECT 1,'Johny'  ,6 Union all
SELECT 2,'George',6  Union all
SELECT 3,'Jisha',6
)
,TableB(Id,Aid,Subname,Result)
AS
(
SELECT 1,1,'SEcinece','Fail' UNION ALL
SELECT 2,1,'Social'  ,'Pass' UNION ALL
SELECT 3,1,'English' ,'Pass' UNION ALL
SELECT 4,2,'SEcinece','Pass' UNION ALL
SELECT 5,2,'Social'  ,'Pass' UNION ALL
SELECT 6,2,'English' ,'Pass' UNION ALL
SELECT 7,3,'SEcinece','Fail' UNION ALL
SELECT 8,3,'Social'  ,'Fail' UNION ALL
SELECT 9,3,'English' ,'Pass'
)
,Final
AS
(
SELECT *,CASE WHEN Dt.CNT<3 Then 'Fail'
                WHEN Dt.CNT=3 Then 'PASS' END AS FinalResult
                 FROM
(
SELECT A.Id,A.Name,B.RESULT,COUNT(B.Result)OVER(PARTITION BY B.AId,A.Name ORDER BY B.AId)AS CNT,
ROW_NUMBER()OVER(PARTITION BY B.AId,A.Name ORDER BY B.AId )AS Seq FROM TableA A
INNER JOIN TableB B
ON A.Id=b.Aid
WHERE B.Result='Pass'
)Dt

)
SELECT Id,Name,FinalResult AS Result FROM Final WHERE Seq=1 ORDER BY 1

输出

Id  Name    Result
1   Johny   Fail
2   George  PASS
3   Jisha   Fail

Answer 3

SELECT CASE WHEN MIN(BitField+0) = 1 THEN 'True' ELSE 'False' END AS MyColumn
 FROM MyTable 

来自以下链接 Applying the MIN aggregate function to a BIT field

Answer 4

根据我的理解，

create table #temp(id int, name varchar(1))
insert into #temp values(1,'p')
,(1,'p')
,(1,'f')
,(2,'p')
,(2,'p')
,(2,'p')
,(3,'p')
,(3,'f')
,(3,'f')

select id, min(name) from #temp group by id, name

with cte as (
select id, name, ROW_NUMBER() over(partition by id order by name) rn from #temp group by id, name
) select id, name, rn from cte where rn = 1