Question

USE [cms]
GO
/****** Object:  StoredProcedure [dbo].[SpGetRelatedProducts]    Script Date: 10/10/2012 14:35:39 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER proc [dbo].[SpGetRelatedProducts](@pid int)
AS
DECLARE @subcate int;
select subcate_id as subcate from product where pid=@pid
SELECT *
FROM product
where product.subcate_id=@subcate




exec SpGetRelatedProducts 2

上面的sql查询无法正常工作。

我只想要那些产品的产品细节，这些产品有subcatid =（给定pid的subcatid）。

有两个问题

只应显示1个输出而不是2
第二次输出无法正常工作

Answer 1

试试这个：

alter proc [dbo].[SpGetRelatedProducts](@pid int)
as

select *
from product as p1
where p1.subcate_id in (
                         select p2.subcate_id 
                         from product as p2
                         where p2.pid = @pid
                       )

Answer 2

未分配@subcate参数：

select @subcate = subcate_id from product where pid=@pid

select * from product where product.subcate_id = @subcate

Answer 3

您也可以在一个声明中做到这一点

SELECT
               P1.* 
    FROM
             product P1
        JOIN
             prodcut P2
                 ON p1.subcate_id = p2.subcate_id
    WHERE
        P2.pid = @pid

并且不用担心设置中间变量。

SQL查询无法正常工作

3 个答案: