Have you tried searching for an answer to this? I'm sure it's been asked before on SQL/Database/Scripting websites. I'm sure there are many valid answers.
How are you going to save the players? SteamID? I don't use SQL that much so I don't know all the nifty features but I would have a table for each weapon and then have a list of the players with their associated value. So, you would have every player in each weapon table once.
But, like I said, there are probably many valid answers and likely one better than mine but you need to make an effort to find the solution in a better place (IMO).