So to update a record lets say...

I have a current value of 150 and the new value will be 250 now how would I
total them to equal 400?

I was thinking

$sql = "UPDATE $table value1 =  value1 + ?

is that correct?  how do you update it with simple math?

What about division...

take the current value in the database + the new value divided by another
number, lets say another field

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