Why is this SQL statement not executing?

Question

I have an SQL statement without a where clause because I want it to affect all rows. I have a column with the name url. Now I want to change the current column url to something else. I want to concatenate something to the current url.

My statement is:

 UPDATE tablename SET url = 'http' || url;

This is in a sql file, which executes and throws no errors but the database is not changing.

Can anyone help?

RDBMS is MySQL

Answer 1

Depending on your engine (in case it isn't Oracle and you have some bizarre MySQL bitwise operator)

UPDATE tablename SET url = CONCAT('http', url);

or

UPDATE tablename SET url = 'http' + url;