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I am using Postgresql 8.3
I have a Database table contaning buy_value and sell_value. I wish to add a DEFAULT function so that on Every Insert, database will calculate the profit according to the buy and sell values and insert that to the related column…
How should I define my alter?
it’s not as simple as changing the DEFAULT value… you’ll need a trigger before insert. (but its not recomended to store calculated fields on the table, because you risk to break the data integrity)
check this out
http://www.postgresql.org/docs/9.1/static/triggers.html
Good Luck