Question

我有两个表：Product和ProductRateDetail。父表是Product。我在产品表中有重复记录，需要是唯一的。 ProductRateDetail表中有条目对应于product表中的重复记录。

不知何故，我需要更新ProductRateDetail表以匹配Product表中的原始（较旧）ID，然后从product表中删除重复项。我会手动完成，但有100个记录。即

之类的东西

UPDATE tbl_productRateDetail SET productID = (originalID from tbl_product)

然后像

DELETE from tbl_product WHERE duplicate ID

并且只删除最近添加的ID数据

示例：（抱歉无法解决此格式问题）

tbl_Product

select * from dbo.Product where ProductCode = '10003'

ProductID    ProductTypeID    ProductDescription       ProductCode     ProductSize
365          1             BEND DOUBLE FLANGED      10003           80mmX90deg
1354            1             BEND DOUBLE FLANGED      10003           80mmX90deg

tbl_ProductRateDetail

SELECT * FROM [MSTS2].[dbo].[ProductRateDetail] WHERE ProductID in (365,1354)

ProductRateDetailID ProductRateID   ProductID   UnitRate
365                    1               365            16.87
1032                   5               365            16.87
2187                   10              365            16.87
2689                   11              365            16.87
3191                   12              365            16.87
7354                   21              1354           21.30
7917                   22              1354           21.30
8480                   23              1354           21.30
9328                   25              1354           21.30
9890                   26              1354           21.30
10452                  27              1354           21.30

Answer 1

这样的事情应该有效：

1）更新引用重复项的产品详细信息

UPDATE tbl_productRateDetail d
   SET productID = (SELECT MIN(p0.productID)
                      FROM tbl_product p0
                      JOIN tbl_product p1 
                            ON p1.ProductTypeID = p0.ProductTypeID
                           AND p1.ProductDescription = p0.ProductDescription
                           AND p1.ProductCode = p0.ProductCode
                           AND p1.ProductSize = p0.ProductSize
                     WHERE p1.productID = d.productId)
 WHERE productID IN (SELECT productID
                       FROM tbl_product
                      WHERE (ProductTypeID, 
                             ProductDescription, 
                             ProductCode, 
                             ProductSize) IN
                            (SELECT ProductTypeID, 
                                    ProductDescription, 
                                    ProductCode,
                                    ProductSize
                               FROM tbl_product
                              GROUP BY ProductTypeID, 
                                       ProductDescription, 
                                       ProductCode, 
                                       ProductSize
                             HAVING COUNT(*) > 1));

2）检测重复

DELETE FROM tbl_product p0
 WHERE productID <> (SELECT MIN(productID)
                       FROM tbl_product p1
                      WHERE p1.ProductTypeID = p0.ProductTypeID
                        AND p1.ProductDescription = p0.ProductDescription
                        AND p1.ProductCode = p0.ProductCode
                        AND p1.ProductSize = p0.ProductSize);

Answer 2

未经测试，因此语法可能会出现一些错误。

首先，从分组的产品ID中取出最小产品ID，然后更新ProductRateDetail中的记录

UPDATE prd1
SET prd1.ProductID = p2.ProductID
FROM ProductRateDetail prd1
INNER JOIN Product p1 ON
p1.ProductID = prd1.ProductID
INNER JOIN
(
SELECT MIN(ProductID) AS ProductID, ProductTypeID, ProductDescription, ProductCode, ProductSize
FROM Product
GROUP BY ProductTypeID, ProductDescription, ProductCode, ProductSize
) p2 ON
p1.ProductTypeID = p2.ProductTypeID AND
p1.ProductDescription = p2.ProductDescription AND
p1.ProductCode = p2.ProductCode AND
p1.ProductSize = p2.ProductSize

然后，删除不是“已选择”ID

的分组产品

DELETE p1
FROM Product p1
INNER JOIN
(
SELECT MIN(ProductID) AS ProductID, ProductTypeID, ProductDescription, ProductCode, ProductSize
FROM Product
GROUP BY ProductTypeID, ProductDescription, ProductCode, ProductSize
) p2 ON
p1.ProductTypeID = p2.ProductTypeID AND
p1.ProductDescription = p2.ProductDescription AND
p1.ProductCode = p2.ProductCode AND
p1.ProductSize = p2.ProductSize AND
p1.ProductID != p2.ProductID

SQL重复问题SQL SERVER 2000

2 个答案: