显示验证消息，其中包含重复的StudentId一对一

Question

我想在SQL Server中检查重复的ID验证，该验证网格显示 行号，验证消息和来自SQL Server的重复ID

我不明白该怎么办？

非常感谢帮助

创建表格

    CREATE TEMPORARY TABLE IF NOT EXISTS Tbl_Student
    (RowID INT PRIMARY KEY auto_increment, StudentID BIGINT);

插入记录

Insert into Tbl_Student(RowID,StudentID) values (1,101)
Insert into Tbl_Student(RowID,StudentID) values (2,102)
Insert into Tbl_Student(RowID,StudentID) values (3,101)
Insert into Tbl_Student(RowID,StudentID) values (4,102)
Insert into Tbl_Student(RowID,StudentID) values (5,103)

请在那里分享任何解决方案

谢谢

Answer 1

尝试以下查询，

SELECT RowID, CONCAT('StudentID ',StudentID, ' is Duplicate) AS Error FROM Tbl_Student WHERE StudentID IN (SELECT StudentID FROM Tbl_Student GROUP BY StudentID  HAVING COUNT(*) > 1)

Answer 2

这是T-SQL代码，您可能需要将其转换为MySql格式：

Select * from(
      Select RowId, Count(*) Over(Partition By StudentId Order By RowId) as Cnt From [YourTable]
) as K
Where Cnt>1

您也可以使用Row_Number或Count聚合函数来达到相同的结果。

这里有很多MySql解决方案：

Find duplicate records in MySQL

Answer 3

要显示重复的内容，

select
  RowID, 
  concat('Student ', StudentID, ' is duplicate') as StudentID
from Tbl_Student where StudentID in (
  select StudentID from Tbl_Student group by StudentID having count(*) > 1
)

Answer 4

您可以在suquery上使用联接编号为1的链结

  select id,  student_id, concat('Stundent id' , student_id, ' is duplicated')
  from  my_table m
  inner join  (
    select student_id 
    from my_table  
    group by student_id 
    having count(*) > 1  
  ) t on t.student_id  = m.student_id

Answer 5

我认为这对您有帮助

select 
      RowID
      concat('Student ', StudentID, ' is duplicate') as Error
from 
      Tbl_Student 
where 
      StudentID in (
select 
      StudentID 
from 
      Tbl_Student 
group by 
      StudentID 
having 
      count(*) > 1);