Question

ok so I do this mysql command:

SELECT CONCAT(SUBSTRING(Familenaam,1,4),SUBSTRING(Voornaam,1,4)) AS `Login` FROM tblusers

This gives me the result for johny cowbell -_> johncowb (=loginname) but this is in a query.

I want that result in my table tblusers in the column “Login”.
How do I do this?

Answer 1

You can use INSERT INTO .. SELECT like so:

INSERT INTO tblusers(login)
SELECT 
  CONCAT(SUBSTRING(Familenaam, 1 ,4), SUBSTRING(Voornaam,1,4)) 
FROM tblusers

If you want to update, you can do this:

UPDATE tblusers t1
INNER JOIN
(
   SELECT 
     userid,
     CONCAT(SUBSTRING(Familenaam, 1 ,4), SUBSTRING(Voornaam,1,4)) login
   FROM tblusers
) t2 ON t1.userid = t2.userid
SET t1.login = t2.login