Question

我有一个包含大量重复项的数据库，每个重复项都有一个唯一的ID，但他们的PermitID和EncID是相同的。我需要删除数据库中除最高ID之外的所有ID。

sql语句，

DELETE FROM tblInvoices 
WHERE EncID = '0237' AND PermitID IN (
SELECT Max(ID) FROM tblInvoices Group BY PermitID)

删除所有记录。我试过了

DELETE FROM tblInvoices 
WHERE EncID = '0237' AND PermitID 
< (SELECT Max(ID) FROM tblInvoices Group BY PermitID)

但我收到错误 Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

数据的一个例子是

ID    PermitID    EncID
1       11          22
2       11          22
3       11          22
4       12          23
5       12          23

我想保留3，删除2和1.我还想保留5并删除4

Answer 1

保持简单。

DELETE FROM tblInvoices 
WHERE ID NOT IN
   (SELECT MAX(ID)
   FROM tblInvoices
   GROUP BY EncID, PermitID)

Answer 2

我能够使用当前的SQL语句

WITH CTE AS
(
    SELECT ROW_NUMBER() OVER (Partition BY PermitID ORDER BY ID) AS RowNumber, *
    FROM tblInvoices
    WHERE EncID = '0237'
)

DELETE FROM CTE 
WHERE RowNumber < 13

Answer 3

你可以试试这个：

WITH cte AS
(  
SELECT row_number() OVER (PARTITION by permitid ORDER BY Id DESC) r,ID,permitid,encid 
FROM tblinvoices    
)
DELETE FROM cte WHERE r > 1

删除多个重复项，在sql中保留最大ID

3 个答案: