与多个列值匹配的SQL查询

Question

我无法解决以下问题。

鉴于以下表格结构和数据，我如何选择匹配两个标签的记录。例如：

+-----------------+------------------+ 
| collection_id |   tag  | 
+-----------------+------------------+ 
|  1  | advertising | 
|  1  |  tutorials | 
|  2  | advertising | 
|  2  |  coding  | 
+-----------------+------------------+ 

如果我搜索广告& &教程，它应该返回collection_id = 1，而不是collection_id = 2

任何指针深受欢迎。

Answer 1

SELECT collection_ID 
FROM tableName 
WHERE tag IN ('advertising','tutorials') 
GROUP BY collection_ID 
HAVING COUNT(*) = 2 

• SQLFiddle Demo

如果标签没有被指定为每个collection_ID

SELECT collection_ID 
FROM tableName 
WHERE tag IN ('advertising','tutorials') 
GROUP BY collection_ID 
HAVING COUNT(DISTINCT tag) = 2 

• SQLFiddle Demo

约束