Update a cell

[cancer10]

Hi!

How do I update a cell of a row which is of a varchar datatype?

For example:

I have a table name, tbl_online_users


and have a column in it, users_online

I would like to update a cell with all users who are online in the following way

Joe, Mark, Peter


I have tried the following query, but it wont work

UPDATE table tbl_online_users SET users_online=users_online + ', Adam'

[Fumigator]

concat()

But I must tell you, that is terrible database design.

[cancer10]

Which is a terrible database design?