MySQL不支持INTERSECT和MINUS及其替代方法

这篇文章主要为大家详细介绍了MySQL不支持INTERSECT和MINUS及其替代方法，具有一定的参考价值，可以用来参考一下。

感兴趣的小伙伴，下面一起跟随四海网的小编小韵来看看吧！

Doing INTERSECT and MINUS in MySQL

Doing an INTERSECT

An INTERSECT is simply an inner join where we compare the tuples of one table with those of the other, and select those that appear in both while weeding out duplicates. So
 

代码如下:

 
SELECT member_id, name FROM a 
INTERSECT 
SELECT member_id, name FROM b 

can simply be rewritten to
 

代码如下:

 
SELECT a.member_id, a.name 
FROM a INNER JOIN b 
USING (member_id, name) 

Performing a MINUS
To transform the statement
 

代码如下:

 
SELECT member_id, name FROM a 
MINUS 
SELECT member_id, name FROM b 

into something that MySQL can process, we can utilize subqueries (available from MySQL 4.1 onward). The easy-to-understand transformation is:
 

代码如下:

 
SELECT DISTINCT member_id, name 
FROM a 
WHERE (member_id, name) NOT IN 
(SELECT member_id, name FROM table2); 

Of course, to any long-time MySQL user, this is immediately obvious as the classical use-left-join-to-find-what-isn't-in-the-other-table:
 

代码如下:

 
SELECT DISTINCT a.member_id, a.name 
FROM a LEFT JOIN b USING (member_id, name) 
WHERE b.member_id IS NULL 

本文来自：http://www.q1010.com/177/9479-0.html

注：关于MySQL不支持INTERSECT和MINUS及其替代方法的内容就先介绍到这里，更多相关文章的可以留意四海网的其他信息。

关键词：MYSQL