MySQL does not support INTERSECT and MINUS and their alternatives

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

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

can simply be rewritten to

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

Performing a MINUS
To transform the statement

 
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:

 
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:

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