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By Burleson D.K., Celko J., Cook J.P.

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This has the side effect that the result table is sorted, but you cannot depend on that. This also explains why the ORDER BY clause is a common feature on UNION 30 SQL Database Programmers Handbook operators. As long as the engine is sorting on all the columns anyway, why not let the programmer decide the sort keys? The UNION ALL preserves the duplicates from both tables in the result table. In most implementations, this statement is done appending one table to the other, giving you a predictable ordering.

For a lot of companies, this was the first time anyone had looked at their legacy systems in years -in decades, in fact. I think we can assume that any legacy system that was easy and cheap to replace was replaced. The next class of systems were those that we thought would be easy to patch, and on those systems, the Y2K staff went to work. There was also a third class of software about which nobody knew anything, but that existed, nonetheless. The side benefit of inspecting this class of programs was that while the programmers were fixing the date handling code, they could also fix any other bad code they found.

A two-part article on syntax and practical employment. Gulutzan, Peter and Trudy Pelzer. SQL Performance Tuning. Addison-Wesley 2003 Lewis, Jonathan. html) An idea that COUNT(DISTINCT) in both the SELECT and the GROUP BY can be more efficient with inline views, on an older version of Oracle. Mullins, Craig. html) Advice to DBAs. Rielau, Serge. html) INSTEAD OF triggers are in vogue among all DBMS vendors. This is the DB2 take. html) This article includes a compact description of the differences between Oracle and Microsoft with respect to views.

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Advanced SQL Database Programmer Handbook by Burleson D.K., Celko J., Cook J.P.

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