Java Oracle Database Development by David Gallardo

By David Gallardo

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Which is meant is determined by context. =). The last set of operators may be unfamiliar. BETWEEN…AND and IN are a kind of wordy shorthand for comparisons that you can also perform using the other operators. BETWEEN…AND is used to compare a value with a range. IN is used to find whether a value is a member of a set of values. The next two, IS NULL and IS NOT NULL, are necessary to test specifically for the presence or absence of a NULL value. They are necessary because when NULL is compared with other values, the result is neither TRUE nor FALSE, but NULL.

The next two, IS NULL and IS NOT NULL, are necessary to test specifically for the presence or absence of a NULL value. They are necessary because when NULL is compared with other values, the result is neither TRUE nor FALSE, but NULL. Because NULL represents an unknown value, the result of a comparison remains unknown, as well. This is true even (or maybe especially) if both values being compared are NULL. It may seem counterintuitive, but the condition NULL=NULL is neither TRUE nor FALSE, it is NULL.

Here, they are categorized according to their first parameter. A few functions do not take any parameters and are categorized as miscellaneous. Because Oracle has a very large number of functions, only a few common ones will be briefly covered. Refer to the Oracle SQL Reference for a complete list. Numeric Functions All numeric functions take one or more numeric values and return a numeric value. These typically perform mathematical operations, such as rounding, calculating the square root, raising to a power, etc.

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