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DateTime functions in SQL Server Part 25
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Sort By. It is implemented as a special form of second normal form, what I can version normal form vnf. You might also have fields that change but you don't wish to track those changes. Yes, you can store promotion details and associate them to products, but what happens when a promotion starts and then ends? Figure 4: Suppose that after an administrator inactivates the record for Dave's Auto Wholesaler, someone else edits that record, reusing its ID ID 1 for a new auto dealer named Bob's Dynamite Autos. JR at this stage I still can't figure out what I need to do to get your code to work. Now we have a problem. Now all FKs can reference the main entity table as normal. You have to switch prices in the products that are affected. If so, you may be in dire need of Effective Dating and not even know it. In a statically defined type table, the values rarely change over time and any changes are carefully planned and executed. And if the start and end dates between versions ever get out of synch, you have a gap or overlap and good luck finding the right values. This is what I call the "Delusions of Eternity" anti-pattern.
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