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

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

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Use a naming convention to mark non-updatable columns. Use the same naming convention for view names as you use for base table names. Alternatively, view names should begin with the name of the table upon which the view depends. [DB2] Document the view's purpose (security, efficiency, complexity hiding, alternate object terminology) in the view's REMARKS metadata. [SQL Server] Make an ordered view with a construct like this: CREATE VIEW ... SELECT TOP 100 PERCENT WITH TIES ... ORDER BY". I would like to end with a recommendation about who has the best implementation of views, but in fact The Big Three are keeping up with each other feature by feature.

Again, this makes sense. How can you tell one unknown NULLs group together. This property has nothing to do with simple search conditions, so don't worry about it for now; I will cover this point in another article on the GROUP BY clause later. All of the SQL datatypes can use the basic comparison operators like equal (=), greater than (>), less than (<), not less than (>=), not greater than (<=) and not equal (<>). With the exception of the rules for NULLs, they behave pretty much as in every other programming language.

Another version of the division can be written so as to avoid three levels of nesting. While it is not original with me, I have made it popular in my books. plane) = (SELECT COUNT(plane) FROM Hangar); There is a serious difference in the two methods. Burn down the hangar, so that the divisor is empty. Because of the NOT EXISTS() predicates in Date's query, all pilots are returned from a division by an empty set. Because of the COUNT() functions in my query, no pilots are returned from a division by an empty set.

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