1

local Players = game:GetService("Players")

local Table = {}

Players.PlayerAdded:Connect(function(player)
    Table.Variable = 123 -- for example

    print(player.Name .. " joined the game!")
end)

Players.PlayerRemoving:Connect(function(player)
    Table.Variable = nil -- remove from table

    print(player.Name .. " left the game!")
end)