Oops I screwed up
SQL code:
SELECT * FROM upgrades A
INNER JOIN upgrades_backup B ON B.steamid = A.steamid
WHERE (
A.playerupgrade1 > ( B.playerupgrade1 + 10)
OR A.playerupgrade2 > ( B.playerupgrade2 + 10 )
OR A.playerupgrade3 > ( B.playerupgrade3 + 10 )
OR A.playerupgrade4 > ( B.playerupgrade4 + 10 )
)