By Donald K. Burleson, Joe Celko, John Paul Cook, Peter Gulutzan
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Additional info for Advanced SQL Database Programmers Handbook
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.
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 it is actually worse than that. If the same query is executed again, but with new statistics or after an index has been dropped or added, the new execution plan could bring the result set back in a different physical order. com/oracle 51 Oh, why did duplicate rows in the second query get different IDENTITY numbers?
If you said 60 seconds, you are technically wrong. It can vary from 59 to 61 seconds because of the leap second adjustment. This is the little adjustment that keeps the solar time aligned with the time calculated by an atomic clock. The Earth wobbles a little bit and it is not a precise as the atomic clock. I am probably one of the few people who sets his wristwatch to the leap second. But a lot of networks, geopositioning satellites and other communications systems really have to worry about it.
Advanced SQL Database Programmers Handbook by Donald K. Burleson, Joe Celko, John Paul Cook, Peter Gulutzan