Is this a viable way to create a multiplayer game?

I made a database in SQL Server with a table Player that has some fields Area, XCoord, YCoord, and Action. I want the client to show all of the players online on the screen if they are in the same area/world as you and get their coordinates. Action is going to store data like MovingDown, MovingLeft, Attacking, Idle so the client knows how to make the other players look on the client's screen. I'll have to send data to the server about the client's coordinates and actions, and retrieve data...

Is this a viable way to create a multiplayer game?