Question

+-------+--------+
| EMPID | SALARY |
+-------+--------+
|     1 |    100 |
|     2 |    200 |
|     3 |    300 |
|     4 |    400 |
|     4 |    400 |
|     5 |    500 |
+-------+--------+

帮我查一下删除最后两行的查询。我已经尝试使用where where条件，但最后三行被删除，因为（4,400）是重复的。

Answer 1

您可以设置

的限制

DELETE `employee`  ORDER BY `EMPID` DESC LIMIT 2

你可以添加你的where子句。在哪里EMPID =＆＃39; 104＆＃39;，EMPID =＆＃39; 105＆＃39;

Answer 2

尝试使用此查询：

WITH CTE AS(
   SELECT [EMPID], [SALARY],
       RN = ROW_NUMBER()OVER(PARTITION BY [EMPID], [SALARY] ORDER BY (SELECT 0))
   FROM dbo.myTable
)
DELETE FROM CTE WHERE RN > 1

Answer 3

试试这个。如果您想要所有重复记录，那么如果员工有重复工资，则会删除该员工，因为您说要删除两条记录。

WITH CTE
     AS (SELECT *,
                cnt= Count(1)OVER(PARTITION BY EMPID
                         ORDER BY (select null))
         FROM   yourTable)
DELETE FROM CTE
WHERE  cnt > 1

Answer 4

假设您要删除所述的最后两行（其中一行是重复的），这应该可以。

<强>查询

;WITH D as (
SELECT ROW_NUMBER() OVER(ORDER BY EMPID DESC) as rn,EMPID, SALARY
FROM YourTable
)
DELETE FROM D
WHERE rn <= 2;

SQL Fiddle

查询将最后两行删除为一行在SQL Server中是重复的

4 个答案: