Question

这是我的表

Display          UPC
0                0553406259120
0                0753406259120
1                0753406259120
1                0453406259120

如果您注意到，第2行和第3行具有相同的UPC。我想删除所有显示= 0和重复upc的行。所以在我的表中我只想删除第2行。到目前为止，这是我的coldfusion代码无效。请指教。

<cfquery name="GetData" datasource="#Application.ds#" dbtype="ODBC" username="#Application.UserName#" password="#Application.Password#">
DELETE UPC
FROM products
WHERE DISPLAY = 0
GROUP BY UPC  
HAVING COUNT(*)>1
</cfquery>

Answer 1

假设您要删除UPC相同的所有行，但Display不同：

DELETE FROM Products as a
WHERE display = 0
AND EXISTS (SELECT '1'
            FROM Products as b
            WHERE b.display <> 0
            AND b.upc = a.upc)

这应该适用于所有RDBMS，并将删除UPC相同但Display代码不同的所有行。

Answer 2

DELETE FROM Products
WHERE DISPLAY = 0 
AND UPC in (SELECT UPC
            FROM Products
            GROUP BY UPC
            HAVING COUNT(UPC)>1)

sql / coldfusion删除重复的行

2 个答案: