Question

假设我有一张这样的表 -

Code  | something
------------------
C01     abc
C02     mnt
C03     lkj
C01     dhl
C04     poi
C05     gtr
C02     rty
C01     asd
-------------------

现在，我只想要表中的那些行，在该列中哪些行多次Code。所以，输出就像 -

Code  | something
------------------
C01     abc
C01     dhl
C01     asd
C02     mnt
C02     rty
-------------------

我是新的SQL服务器和查询的东西。拜托，帮帮我吧。提前谢谢。

Answer 1

SELECT * FROM Table
WHERE code IN (
    SELECT Code FROM Table
    GROUP BY Code HAVING COUNT(*) > 1
)

Answer 2

select *
from YourTable
where Code in
(
    select Code
    from YourTable
    group by Code
    having count(*) > 1
)

Answer 3

;WITH codes AS 
(
  SELECT code 
  FROM dbo.table
  GROUP BY code 
  HAVING COUNT(*) > 1
)
SELECT code, something 
  FROM dbo.table AS t
  INNER JOIN codes AS c 
  ON t.code = c.code;

Answer 4

SELECT T2.* 
FROM TableName, (SELECT Code from TableName T1 
                 GROUP BY T1.Code 
                 HAVING (COUNT(T1.Code) > 1)) T3
WHERE T2.Code = T3.Code

如何根据存在重复数据的列查找行

4 个答案: