同一列的多個WHERE子句

我在下面寫了查詢，它返回我需要的數據。但是，我不禁想到還有更好的方法來編寫它。我需要的是找到Table1中的所有唯一行，其價格大於指定供應商在供應商所屬類別中的價格。（理論上，供應商可以屬於的類別數量不受限制）。同一列的多個WHERE子句

表1是含有VendorID，Category，和price
一個交叉引用表表2中包含的供應商信息
有包含類別名的類別表。

...

SELECT DISTINCT Table2.name, Table2.city, Table2.state 
FROM Table1 INNER JOIN Table2 ON Table1.VendorID = Table2.VendorID 
WHERE Table1.Category IN (49,50,45) 
    AND Table1.price > (SELECT price FROM Table1 WHERE VendorID = 69041 AND Category = 50) 
    AND Table1.price > (SELECT price FROM Table1 WHERE VendorID = 69041 AND Category = 49) 
    AND Table1.price > (SELECT price FROM Table1 WHERE VendorID = 69041 AND Category = 45)

來源

2012-08-14 RHPT

類別表有vendoid嗎？ – AnandPhadke 2012-08-14 03:49:54

否。分類表只是一個類別和標識列表。 – RHPT 2012-08-14 14:56:55

你可以使用一個公用表表達式或子查詢中，你首先需要的所有數據，以拉，然後加入你的表到「查看」：

;WITH MaxPricePerCategory 
AS 
    (
    SELECT MAX(Price) AS [Price] 
     -- You can remove category if you just need the maximum price 
     , Category 
    FROM Table1 
    WHERE VendorID = 69041 
    AND Table1.Category IN (49,50,45) 
    GROUP BY Category 
    ) 
SELECT DISTINCT Table2.name 
    , Table2.city 
    , Table2.state 
FROM Table1 
JOIN Table2 
    ON Table1.VendorID = Table2.VendorID 
JOIN MaxPricePerCategory MPPC 
    ON Table1.Category = MPPC.Category 
     AND Table1.price > MPPC.Price

來源

2012-08-14 03:50:18

也許只是最大值嗎？

SELECT DISTINCT Table2.name, Table2.city, Table2.state 
FROM Table1 INNER JOIN Table2 ON Table1.VendorID = Table2.VendorID 
WHERE Table1.Category IN (49,50,45) 
    AND Table1.price > (SELECT MAX(price) FROM Table1 WHERE VendorID = 69041 AND Category = IN (49,50,45))

來源

2012-08-14 03:58:05

同一列的多個WHERE子句

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