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

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

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But wait a minute, most programming languages work with Boolean logic and have only TRUE and FALSE logical values. SQL and Codd's first relational model have a thing called a NULL and it makes things ... interesting. The Null of It All A NULL is not a value; it is a marker for a value that is missing. SQL does not know why the value is missing -- semantics is your job. But SQL does have syntax to handle NULLs. com/oracle 37 NULLs propagate in calculations. That makes sense; if I don't know what something is, then why would I know what a calculation done with it is?

But now use a statement with a query expression in it, like this: INSERT INTO Foobar (a, b, c) SELECT x, y, z FROM Floob; Since a query result is a table, and a table is a set that has no ordering, what should the IDENTITY numbers be? The entire, whole, completed set is presented to Foobar all at once, not a row at a time. ) ways to number (n) rows, so which one do you pick? The answer has been to use whatever the physical order of the result set happened to be — that nonrelational phrase, "physical order" again.

But in future this too might become obsolete. It is already fairly easy to make stored procedures that handle the job. If you want to do a materialization but don't want (or don't have the authority) to make a new view, you can do the job within one statement. com/oracle SQL the correct term for [that thing that looks like a subquery in the FROM clause] is: table reference. Tips Over time, users of views have developed various "rules" that might make view use easier. The common ones are: Use default clauses when you create a table, so that views based on the table will more often be updatable.

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