Adding into an existing row

I use this command:
insert into orders (foobar) values ('a') where id = "1";
I now have a table called "orders" with a row called "foobar". Its id is "1" and the row "foobar" where id equals "1" is "a".

What I am wanting to do is add into the existing row, so that "a" becomes "ab".
Is it possible to add into an existing row, rather than overwrite it?

Row cant have name (foobar).
You can update single column in a row. That would be what you want.


update orders set foobar = 'a' where id = 1

I use this command:
insert into orders (foobar) values ('a') where id = "1";


No, you don't. That is invalid SQL. You can't use a WHERE clause with INSERT.

I would *assume* you meant that you did

INSERT INTO orders ( id, foobar ) VALUES ( 1, 'a' )

And then, to add on to foobar, you would do

UPDATE orders SET foobar = CONCAT(foobar,'b') WHERE id = 1