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RETRIEVAL: THE BASICS
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Listing 4-14. Sorting in Descending Order with ORDER BY ... DESC select from where order ename, 12*msal+comm as yearsal employees job = 'SALESREP' by yearsal desc;
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ENAME YEARSAL -------- -------ALLEN 19500 TURNER 18000 MARTIN 16400 WARD 15500 When sorting, null values cause trouble (when don t they, by the way ). How should columns with missing information be sorted The rows need to go somewhere, so you need to decide. You have four options as to how to treat null values when sorting: Always as first values (regardless of the sorting order) Always as last values (regardless of the sorting order) As low values (lower than any existing value) As high values (higher than any existing value)
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Figure 4-2 shows how you can explicitly indicate how to treat null values in the ORDER BY clause for each individual column expression. Let s try to find out Oracle s default behavior for sorting null values. See Listing 4-15 for a first test. Listing 4-15. Investigating the Ordering of Null Values select from where order evaluation registrations attendee = 7788 by evaluation;
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EVALUATION ---------4 5 The null value in the result is tough to see; however, it is the third row. If you change the ORDER BY clause to specify a descending sort, the result becomes as shown in Listing 4-16.
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Listing 4-16. Testing the Ordering of Null Values select from where order evaluation registrations attendee = 7788 by evaluation DESC;
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EVALUATION ---------5 4 Listings 4-15 and 4-16 show that Oracle treats null values as high values. In other words, the default behavior is as follows: NULLS LAST is the default for ASC. NULLS FIRST is the default for DESC.
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4.5 AND, OR, and NOT
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You can combine simple and compound conditions into more complicated compound conditions by using the logical operators AND and OR. If you use AND, you indicate that each row should evaluate to TRUE for both conditions. If you use OR, only one of the conditions needs to evaluate to TRUE. Sounds easy enough, doesn t it Well, the fact is that we use the words and and or in a rather sloppy way in spoken languages. The listener easily understands our precise intentions from the context, intonation, or body language. This is why there is a risk of making mistakes when translating questions from a natural language, such as English, into queries in a formal language, such as SQL.
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Tip It is not uncommon to see discussions (mostly after the event) about misunderstandings in the precise wording of the original question in natural language. Therefore, you should always try to sharpen your question in English as much as possible before trying to convert those questions into SQL statements. In cases of doubt, ask clarifying questions for this purpose.
Therefore, in SQL, the meaning of the two keywords AND and OR must be defined very precisely, without any chance for misinterpretation. You will see the formal truth tables of the AND, OR, and NOT operators in Section 4.10 of this chapter, after the discussion of null values. First, let s experiment with these three operators and look at some examples.
The OR Operator
Consider the operator OR. We can make a distinction between the inclusive and the exclusive meaning of the word. Is it okay if both conditions evaluate to TRUE, or should only one of the two be TRUE In natural
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languages, this distinction is almost always implicit. For example, suppose that you want to know when someone can meet with you, and the answer you get is next Thursday or Friday. In this case, you probably interpret the OR in its exclusive meaning. What about SQL is the OR operator inclusive or exclusive Listing 4-17 shows the answer. Listing 4-17. Combining Conditions with OR select from where or CODE ---JAV PLS XML RSD code, category, duration courses category = 'BLD' duration = 2;
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