MYSQL Select on two values one column

问题

I need to select a row from my mysql table.

In the table there are two rows with one equal value.

TABLE
-----
articleId
keywordId

Now I need to select an article, that has keyword Id = 1, as well as keyword Id = 12.

Every link to a keyword has its own record.

How can I do one select query to know, if there is an article, that matches the two keywords?

回答1:

Try this:

SELECT *  
FROM tablename 
WHERE keywordId IN (1, 12) 
GROUP BY articleId 
HAVING COUNT(*) = 2; 

Check the SQL FIDDLE DEMO

回答2:

This is called Relation Division. Here is one way to do so:

SELECT * 
FROM tablename 
WHERE articleId IN
(
   SELECT articleId
   FROM tablename
   WHERE KeywordId IN (1, 2) 
   GROUP BY articleId
   HAVING COUNT(KeywordId ) = 2
);;

回答3:

You can also use subqueries for each keyword and join them

select k1.articleId from
(
    select articleId from TABLE where keywordId = 1
) k1
inner join
(
    select articleId from TABLE where keywordId = 12
) k2 on k1.articleId = k2.articleId

Depending on indexes and table size this can be more efficient than Group By

回答4:

SELECT * 
FROM `table_name` 
WHERE `keywordId` = '1' AND `keywordId` = '12' 

回答5:

SELECT * 
FROM table 
WHERE keywordId IN (1, 12);

回答6:

select ArticleId from Table where keywordId = 1
Intersect
select ArticleId from Table where KeywordId = 12

来源：https://stackoverflow.com/questions/14196134/mysql-select-on-two-values-one-column