避免SQL查詢中出現重複行

Question

我在SQL Server 2008上使用以下SQL查詢來從products和categories表中選擇行。

SELECT products.idProduct, sku, description, listPrice, 
    smallImageUrl, isBundleMain, rental, visits 
FROM products, categories_products 
WHERE products.idProduct = categories_products.idProduct 
AND categories_products.idCategory = "& pIdCategory&" 
AND listHidden=0 
AND active=-1 
AND idStore = " &pIdStore& " 
ORDER BY description 

問題是某些行是重複的。那些副本通常由products.idProduct列確定，所以我想要更改查詢以便相同的products.idProduct不會出現兩次，例如，表示其中一個行具有products.idProduct = 3438，而另一行具有相同的產品ID以及僅有一個products.idProduct得到顯示

Answer 1

您需要使用不同的。嘗試下面

SELECT distinct 
    products.idProduct, sku, description, listPrice, smallImageUrl, 
    isBundleMain, rental, visits 
FROM products, categories_products 
WHERE products.idProduct=categories_products.idProduct 
    AND categories_products.idCategory="& pIdCategory&" 
    AND listHidden=0 AND active=-1 
    AND idStore=" &pIdStore& " 
ORDER BY description 

Answer 2

使用DISTINCT如下圖所示：

SELECT DISTINCT products.idProduct, 
     sku, description, listPrice, 
     smallImageUrl, isBundleMain, rental, visits 
FROM products, categories_products 
WHERE products.idProduct = categories_products.idProduct 
AND categories_products.idCategory = "& pIdCategory&" 
AND listHidden = 0 AND active = -1 
AND idStore =" &pIdStore& " 
ORDER BY description 

Answer 3

使用DISTINCT在你的領域你的選擇查詢。