Question

有没有办法简化这个WHERE语句，所以只需要声明一次Airport和StoreName，让类别和夹具变化？

SELECT * FROM  Product_Display
WHERE (Airport = 'JFK' AND StoreName = 'T3' AND Category = 'Pralines' AND FIXTURE like '%W15%') 
OR (Airport = 'JFK' AND StoreName = 'T3' AND Category = 'Kinder' AND FIXTURE like '%W12%') 
OR (Airport = 'JFK' AND StoreName = 'T3' AND Category = 'Nutella' AND FIXTURE like '%G04%') 
OR (Airport = 'JFK' AND StoreName = 'T3' AND Category = 'Tic Tac' AND FIXTURE like '%W12%')

Answer 1

您可以简化如下

SELECT * FROM  Product_Display
WHERE Airport = 'JFK' AND StoreName = 'T3' AND ((Category = 'Pralines' AND FIXTURE like '%W15%') 
OR (Category = 'Kinder' AND FIXTURE like '%W12%') 
OR (Category = 'Nutella' AND FIXTURE like '%G04%') 
OR (Category = 'Tic Tac' AND FIXTURE like '%W12%'))

希望这会帮助你。

Answer 2

SELECT  *
FROM    Product_Display
WHERE   Airport = 'JFK'
        AND StoreName = 'T3'
        AND ( ( Category = 'Pralines' AND FIXTURE LIKE '%W15%' )
              OR ( Category = 'Kinder' AND FIXTURE LIKE '%W12%' )
              OR ( Category = 'Nutella' AND FIXTURE LIKE '%G04%' )
              OR ( Category = 'Tic Tac' AND FIXTURE LIKE '%W12%' )
            )

Answer 3

以下查询在语义上相同，但可能更容易阅读：

SELECT * FROM  Product_Display
WHERE (Airport = 'JFK' AND StoreName = 'T3') AND
  (    (Category = 'Pralines' AND FIXTURE like '%W15%') 
    OR (Category = 'Kinder' AND FIXTURE like '%W12%') 
    OR (Category = 'Nutella' AND FIXTURE like '%G04%') 
    OR (Category = 'Tic Tac' AND FIXTURE like '%W12%')
  )

Answer 4

只需将机场和商店名称放在括号内，如下所示：

SELECT * FROM  Product_Display
WHERE Airport = 'JFK' AND StoreName = 'T3' AND 
(
    (Category = 'Pralines' AND FIXTURE like '%W15%') 
    OR (Category = 'Kinder' AND FIXTURE like '%W12%') 
    OR (Category = 'Nutella' AND FIXTURE like '%G04%') 
    OR (Category = 'Tic Tac' AND FIXTURE like '%W12%')
)

简化WHERE子句

4 个答案: