如何使用数组中的值通过2行比较来选择mysql中的表？

Question

I have a select query like this one:

SELECT * FROM `table` 
WHERE `is_deleted`!='1'  AND 
(
 (`a`='1' AND `b`='1') 
  OR 
 (`a`='2' AND `b`='2')
) 
ORDER by `timestamp` DESC LIMIT 0,20

How to make a select query using "IN" operator with comparison rows a and b ?

Answer 1

Also you could use in with several fields at once.

SELECT * FROM `table` 
WHERE `is_deleted`!='1' 
    AND (`a`, `b`) IN ((1,1),(2,2))
ORDER by `timestamp` DESC LIMIT 0,20

It's strange, but there is no description of this behavior in the documentation IN , only a little note in the comments.

The IN operator also works with tuples, at least in version 4.1: mysql> select (3,4) in ((2,3),(3,4));