Question

我正在尝试获取产品并将相关类别包含为逗号分隔列表。以下是我尝试过的，但它只返回1个产品。我尝试了LEFT和LEFT OUTER连接，但都没有工作。有什么想法吗？

INSERT INTO Table (S,SN,SNM,ID,U,G,Gr,Hu,Huv,Date,IDt,B) 
 VALUES ('2007', '94920', 'Text','9492','Text','949',''Text,'94','Text;    
  r','2001-01-01',0,CONCAT(1,1)

Answer 1

按

添加分组

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----------------- example -----------

SELECT 'U' as ACTION, product_id, GROUP_CONCAT(PC.category_id SEPARATOR ', ')     as Categories 
FROM Products P LEFT JOIN Product_Category PC 
ON PC.product_id = P.product_id group by P.product_id;

Answer 2

GROUP_CONCAT函数是一个聚合函数，并且正在使用GROUP BY子句。如果您的GROUP BY语句中没有SELECT，则它会使用所有找到的结果。

MySQL查询以获取所有产品及其类别

2 个答案: