this is arafat

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sir,
my problem is that,
in my project i have a page call stock.where every day stock will be
change .
cause product enter in the stock and product out form the stock
so,stack will be change when product will enter and out.
thats why i hav to use UPDATE statement .
plz write to me what kind of UPDATE statemnt i have to write.


For Example: Balance 100 (caton)
product enter 50 (caton)=stock(100+50)=150 (caton)
product out 50 (caton)=stock(150-50)=100 (caton);

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