By Donald K. Burleson, Joe Celko, John Paul Cook, Peter Gulutzan
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Extra resources for Advanced SQL Database Programmers Handbook
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. Include the table's primary key in the view's select list. 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.
Give me any line segment and I can cut it into smaller segments endlessly. But we run into the problem that the defining property of a point is that it cannot be further subdivided. So how can there be points in a continuum? 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.
With the exception of the rules for NULLs, they behave pretty much as in every other programming language. The logical operators are also familiar looking. They are AND, OR and NOT, and they are found in pretty much every other programming language. The gimmick is that these are three valued logical operators and not two valued ones. The UNKNOWN value results from using NULLs in comparisons and other predicates, but UNKNOWN is a logical value and not the same as a NULL, which is a data value. com/oracle x NOT ================== TRUE FALSE UNK UNK FALSE TRUE AND | TRUE UNK FALSE ============================= TRUE | TRUE UNK FALSE UNK | UNK UNK FALSE FALSE | FALSE FALSE FALSE OR | TRUE UNK FALSE ============================ TRUE | TRUE TRUE TRUE UNK | TRUE UNK UNK FALSE | TRUE UNK FALSE There is anther predicate of the form (x IS [NOT] NULL) in SQL that exits because you cannot use (x = NULL) to test for a NULL value.
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