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Posted by Eugene on 02/22/07 22:09
Hi all,
I have the following table
Name Date Wish Valid
Name is person's name, date defaults to getdate() and is never
assigned directly (datetime field), Wish is some message, and Valid is
bit, 1 indicates if the wish is the latest, and therefore valid. All
previous wishes are kept in database, and are "invalidated" by setting
the Valid to 0.
So, a typical data set looks like:
Name Date Wish Valid
Joe 02/01/2007 Ice Cream 0
Joe 02/04/2007 Bicycle 0
Joe 02/06/2007 PS3 0
Joe 02/22/2007 XBox 360 1
Mary 02/02/2007 Barbie 0
Mary 02/04/2007 Cindy 0
Mary 02/06/2007 Barbie house 0
Mary 02/20/2007 Get married 1
My users want to see the initial wish at some point and another one
some time later (they provide dates). So, if someone wanted to see
changes in wishes between 02/03 and till 02/15, they would get that
Joe's initial wish was Bicycle and the latest that he wanted was PS3.
As for Mary, she started wanting Cindy and ended up thinking about the
Barbie house.
I can do UNION, but is there another way to do that?
Thank you.
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