Question

我有两张桌子：Products和CategoryProducts CategoryProducts包含：

PrdID    Category
-----------------

Products包含：

PrdID   Barcode   Url
-----------------------

我有产品的条形码值，例如111111.

需要选择具有相同类别的所有Products.Url，如此项目分类

拥有Products.PrdID，我可以从CategoryProducts获得所有需要的PrdID：

select distinct c1.PrdID
from CategoryProduct_MM c1
where c1.CategoryID in (select c2.CategoryID
                        from CategoryProduct_MM c2
                        where c2.PrdID = 175)

Answer 1

SELECT 
    p.url
FROM
    Products p
JOIN
    CategoryProducts cp ON cp.PrdID = p.id
// WHERE p.id = 175
GROUP BY p.url, p.Category

如果您需要添加评论查询

Answer 2

根据您的评论，这就是您想要的：

SELECT t.Url
FROM Products t
INNER JOIN CategoryProducts s
ON(s.PrdID = t.PrdID)
WHERE s.CategoryID = (select p.categoryID from CategoryProducts p
                      INNER JOIN Products f ON(p.prdID = f.prdID)
                      WHERE f.barcode =  42244)

选择所有网址，其用户与PrdID属于同一类别 - > 175

Answer 3

 SELECT p.Url, p.PrdID
     FROM Products p 
JOIN CategoryProduct cp 
    ON p.PrdID = cp.PrdID 
JOIN 
Category c on c.id = cp.CategoryID AND cp.PrdID =175

//你需要加入表类别告诉我你的分类表结构

来自2个表的Sqlite select语句

3 个答案: