Re: Doing Summation on multiple criterias on the same column in a
am 01.04.2008 15:44:10 von Joe Celko>> And do you think the fact that John likes lemonade should be described by other facts in the database <<
How about a list of beverages, with the value Lemonade in it? That
would be nominal scale and not a flag. When we decide to research
other beverages, we extend the scale. Unlike a flag, I can ask how
much of a given beverage he drinks.
I extrapolate that if John drinks s certain number of Cokes and is of
a certain age, then I stand an 85% chance of selling him Pepsi (i.e.
kids the sweeter Pepsi to Coke). You cannot get that kind of
information from flags.