Mysql Where … In … AND where … in … should only match on same index

问题

I have the query:

SELECT * FROM `users` 
WHERE (`firstname` LIKE 'Luke' AND `lastname` LIKE 'Skywalker') OR  
 (`firstname` LIKE 'Foo' AND `lastname` LIKE 'Bar') OR 
(`firstname` LIKE 'Tom' AND `lastname` LIKE 'Turner');

But i would like to make it a bit more readable by using a where ... in ... I tried

SELECT * FROM users 
WHERE `firstname` 
    IN ('Luke','Foo','Tom') AND `lastname` IN ('Skywalker','Bar','Turner');

But unfortunately this will also match "Tom Skywalker", "Foo Turner" and all mixes you can think off.

I have to select on first and lastname (perhaps more fields like DOB) since i am getting data from an external API and i have to check if those names are in our system.

回答1:

SELECT * 
FROM users
WHERE (firstname, lastname) 
      IN ( ('Luke', 'Skywalker') 
         , ('Foo' , 'Bar') 
         , ('Tom' , 'Turner')
         )
;

回答2:

Using LIKE operator without wildcards doesn't make much sense. I think you should use =, particularly if you have to check if those names are in our system.

SELECT * FROM users
WHERE (firstname = 'Luke' AND lastname = 'Skywalker') OR 
      (firstname = 'Foo' AND lastname = 'Bar') OR 
      (firstname = 'Tom' AND lastname = 'Turner')

If you use an IN operator, as you said, will match different combinations. I think the previous example should be the fastest way to compare them.

回答3:

You can combine them with concat:

WHERE concat(`firstname`,'-',`lastname`)
   IN ('Luke-Skywalker', 'Foo-Bar', 'Tom-Turner');

来源：https://stackoverflow.com/questions/10111153/mysql-where-in-and-where-in-should-only-match-on-same-index

标签

mysql

where-clause