Question

学生表

Student Id  Student Name
1           Vijay
2           Ram

学生明细表

Student ID  Code    StudentIdentityNumber
1          Primary      143
1          Secondary    143
1          Teritary     143
2          Primary      123
2          Secondary    123
2          Teritary     126

需要输出

StudentID  PrimaryIdentity    SecondaryIdentity                 TeritaryIdentity


2          123                             123                            126

我只想要这个输出。输出没有StudentID 1，因为对于他来说，主要的次要和相同的数字是相同的。希望很清楚

需要简单的解决方案。是代码列只有三个。仅限静态

Answer 1

SELECT sd1.Student, 
       sd1.StudentIdentityNumber as Primary,
       sd2.StudentIdentityNumber as Secondary,
       sd3.StudentIdentityNumber as Teritary
FROM StudentDetail sd1
JOIN StudentDetail sd2
  ON sd1.StudentID  = sd2.StudentID  
 AND sd1.Code = 'Primary'
 AND sd2.Code = 'Secondary'
JOIN StudentDetail sd3
  ON sd2.StudentID  = sd3.StudentID 
 AND sd2.Code = 'Teritary' 
WHERE sd1.Primary <> sd2.Secondary
  or  sd1.Primary <> sd3.Teritary

Answer 2

select pvt.StudentID, 
pvt.[Primary] PrimaryIdentity, 
pvt.Secondary SecondaryIdentity, 
pvt.Teritary TeritaryIdentity
from StudentDetail sd
pivot
(
    max(StudentIdentityNumber)
    for code in ([Primary],Secondary,Teritary)
) as pvt
where pvt.[Primary] <> pvt.Secondary 
or pvt.Secondary <> pvt.Teritary

Answer 3

请查看以下查询：希望它可以帮到你。

WITH cte 

as (SELECT StudentID , [Primary],[Secondary],[Teritary] 
FROM 

(SELECT 
StudentID , Code, StudentIdentityNumber FROM StudentDetail) s

Pivot

( max(StudentIdentityNumber) for Code in ( [Primary],[Secondary],[Teritary]) )as pvt

)

SELECT * FROM cte where cte.[Primary]<>cte.[Secondary] or cte.[Primary]<> cte.Teritary

显示属于同一表

3 个答案: