[mv] Which is less expensive computationally?

[Chris Rapier <rapier@psc.edu>]

******    message to minivend-users from Chris Rapier <rapier@psc.edu>     ******

I have a flag set in a database so new customers can get a discount.
After they have made their firt order I need to set this to zero.

Which would be less expensive;
Doing a lookup in the database, then an if, and then setting it to zero
if it is not already zero?

-or-

Automatically setting it to zero regardless of its previous value?

I've a feeling its less taxing to just set it to zero each time unless
database writes are a lot more intensive than both a read and a
conditional.
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