Best update query for mysql table

[Cooldude]

I have a file hosting site where I provide a point for every unique download to user.Sample of my table

These points can be redeemed by user. So for example if a user redeems 100 points than what is the best query to reduce points available from each row till 100 points are reduced.Thank You.

 

[Raviina]

better to use words to call it for the better

 

[zatch]

Very good is great