Download Advanced SQL Database Programmers Handbook by Donald K. Burleson, Joe Celko, John Paul Cook, Peter PDF

By Donald K. Burleson, Joe Celko, John Paul Cook, Peter Gulutzan

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On the other hand, could performance be improved by altering a column to a smaller sized datatype, say INTEGER to SMALLINT? com/oracle SQL TIMESTAMP datatype CHAPTER 7 Keeping Time SQL is the first programming language to have explicit temporal datatypes. I have had the theory that if Cobol had been designed with a TIMESTAMP datatype, we would have avoided all that Y2K trouble. At least now, more people are aware of the ISO 8601 time and date display standards. Who knows? Maybe people will start to use them.

Maybe people will start to use them. The temporal support in each SQL product can be classified as either a "Unix-style" or "Cobol-style" internal representation. In the Unix-style representation, each point in time is shown as a very large integer number that represents the number of clock ticks from a base date. This is how the Unix operating system handles its temporal data. The use of clock ticks makes calculations very easy — it becomes simple integer math. However, it is hard to convert the clock ticks into a yearmonth-day-hour-minute-second format.

A period can have a start time, a stop time or both inside the session; this case is why you need to remove the duplicate period numbers. com/oracle Internals of IDENTITY datatype Column CHAPTER 8 The Ghost of Sequential Processing When we were first creating relational database products, we really did not understand at a fundamental level what we were doing. As a result, we made a lot of mistakes then and have to live with them now. The biggest mistakes come from exposing the physical representation of the logical model to the programmer.

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