Question

我有以下要求，以更精确地说明SQL参数化查询：

select * from `products` 
where (exists (select * from `productslocation` where `products`.`Id` = `productslocation`.`Product_Id` and `Country_Id` = ?) and 
exists (select * from `productprices` where `products`.`Id` = `productprices`.`Products_Id` and `Price` >= ?) 
and `Organization_Id` = ? and `name` like ? or `Description` like ?) and `Status` = ?

此查询仅使用运算符country检索price，WHERE EXISTS存在的产品。

如果找到，它将为第一个子查询返回TRUE，然后处理其余两个查询WHERE。第一个子查询返回TRUE，第二个子查询返回TRUE，因为子查询也正确。 result = TRUE * TRUE = TRUE。但这是错误的结果。

问题是，WHERE EXISTS的结果需要在两个内部查询中使用。

这是否意味着我需要在WHERE EXISTS上替换JOIN'S？还是可以修改上面的查询？

Answer 1

那不是更好吗？试试这个：

select * from `products` inner join productprices on `products`.`Id` = `productprices`.`Products_Id`
INNER JOIN `productslocation` ON `products`.`Id` = `productslocation`.`Product_Id`
where (`Organization_Id` = ? and `name` like ? or `Description` like ?) and `Status` = ? 
AND `productprices`.`Price` >= ?
and `productslocation`.Country_Id` = ?

Answer 2

您错过了or语句的方括号：

select * from `products` 
where (exists (select * from `productslocation` where `products`.`Id` = `productslocation`.`Product_Id` and `Country_Id` = ?) and 
exists (select * from `productprices` where `products`.`Id` = `productprices`.`Products_Id` and `Price` >= ?) 
and `Organization_Id` = ? and (`name` like ? or `Description` like ?)) and `Status` = ?

Answer 3

您的括号和OR和AND使该语句变得非常复杂。
试试这个：

    select * from `products` 
    where 
    (
    exists (select * from `productslocation` where `products`.`Id` = `productslocation`.`Product_Id` and `Country_Id` = ?) and 
    exists (select * from `productprices` where `products`.`Id` = `productprices`.`Products_Id` and `Price` >= ?) and 
    `Organization_Id` = ? and (`name` like ? or `Description` like ?) and `Status` = ?
    )

Answer 4

您正在寻找一个查询，该查询可根据各种条件过滤products，其中一些条件涉及引用关系。

假设您与参照表具有1-1关系，那么您应该可以使用JOIN s：

select *
from 
    `products` 
    inner join `productslocation` 
        on `products`.`Id` = `productslocation`.`Product_Id` and `productslocation`.`Country_Id` = ?
    inner join `productprices` 
        on  `products`.`Id` = `productprices`.`Products_Id` and `productprices`.`Price` >= ?
where
    `products`.`Organization_Id` = ? 
    and `products`.`name` like ? 
    and `products`.`Description` like ?
    and `products`.`Status` = ?

内部条件在哪里存在SQL？

4 个答案: