Question

我有一张看起来像这样的表

Tag_Id    Bid     Category   Title
  1        1        Toys     Ludo
  2        1        Toys     Snakes
  3        2        Food     Potato
  4        1        Food     Chicken
  5        1        Name     Chris
  6        2        Name     Joe

我想根据以下条件编写一个查找Bid的查询。

Find Bid's where 
(
    (Category = "Toys" AND Title = "Ludo") 
    OR 
    (Category = "Toys" AND Title = "Snakes")
) 
AND (Category = "Food" AND Title = "Potato") 
AND 
(
    (Category = "Name" AND Title = "Chris") 
    OR 
    (Category = "Name" AND Title = "Joe")
)

请注意，不同类别之间的相同类别和AND之间存在OR。有没有办法通过单一查询实现这一目标？

Answer 1

SELECT Bid 
FROM yourTable 
WHERE ( (Category = "Toys" AND Title = "Ludo") OR (Category = "Toys" AND Title = "Snakes") )
AND (Category = "Food" AND Title = "Potato") 
AND ( (Category = "Name" AND Title = "Chris") OR (Category = "Name" AND Title = "Joe") )

你已经写过最难的了。

Answer 2

尝试

SELECT  Bid FROM bidTable WHERE Category = "Toys"
UNION
SELECT  Bid FROM bidTable WHERE Category = "Food"
UNION
SELECT  Bid FROM bidTable WHERE Category = "Name"

我认为你得到了所有显示的行然后为什么这么多条件......你可以在WHERE子句中添加条件

根据多行条件选择ID

2 个答案: