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

ISBN-10: 097443552X

ISBN-13: 9780974435527

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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.

When you give a year, say 2000, you are really giving me an interval of 365 days. Give me a date, say 2000-01-01, you are not giving me a point; you are identifying an interval of 24 hours. Give me the date and time 2000-01-01 00:00:00 and you are giving me an interval of 60 seconds. It never stops!! The decision in SQL was to view time as a series of open ended intervals. That is, the segment includes the starting point in time, but never gets to the end point of the interval. This has some nice properties.

That is, their rows have the same structure, so they can be put in the same final result table. com/oracle very implementation-dependent and you should check it out for yourself. What is interesting is that the result of a UNION has no name, and its columns are not named. If you want to have names, then you have to use an AS operator to create those names, thus. ((SELECT a, b, c FROM TableA WHERE city = 'Boston') UNION (SELECT x, y, z FROM TableB WHERE city = 'New York')) AS Cities (tom, dick, harry) However, in actual products will find a multitude of other ways of doing this: The columns have the names of the first table in the UNION statement.

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


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