MySQL delete last 4 letters

Question

I need a MySQL query (if PHP is required you can use that too) that will delete the ending of all the values on one column named 'url'.

The problem is that I saved the urls having the .php and now I want to delete that ending from all the values in the database.

Example:

old values:

my_url.php
my_sadas.php

new values:

my_url
my_sadas

Answer 1

UPDATE mytable
SET myfield = SUBSTRING(myfield, 1, LENGTH(myfield)-4) ;

If you want to also check whether the field ends with '.php' before truncating, you can add this condition:

UPDATE mytable
SET myfield = SUBSTRING(myfield, 1, LENGTH(myfield)-4)
WHERE RIGHT(myfield, 4) = '.php' ;

Oh, there's also LEFT() which can be used instead of SUBSTRING() as well

And CHAR_LENGTH() should be used instead of LENGTH() as it is multi-byte safe (while LENGTH() is not):

UPDATE mytable
SET myfield = LEFT(myfield, CHAR_LENGTH(myfield)-4)
WHERE RIGHT(myfield, 4) = '.php' ;

Answer 2

UPDATE files
SET fileName = SUBSTRING(fileName, 1 , (LENGTH(fileName) - 4)) ;