I am trying to add data to a column in an existing row using sql

Question

I am trying to add data into a column called address for a certain user. This is the code I am using;

 Insert into register(address) values("Cork") where userId=1;

Answer 1

Try this:

Update register set address='Cork' where userId=1

If something already exists, we use Update.

Answer 2

I suspect you need update statement rather than insert :

update register
     set address = 'Cork'
where userId = 1;

Answer 3

If you want to append a value, use the CONCAT() function, as in:

update register set address = concat(address, 'Cork') where userId = 1;

If you want to set the value, then a simple UPDATE will do, as in:

update register set address = 'Cork' where userId = 1;