| Oracle® Database SQL Language Reference 11g Release 2 (11.2) Part Number E26088-02 | 
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ABS returns the absolute value of n.
This function takes as an argument any numeric data type or any nonnumeric data type that can be implicitly converted to a numeric data type. The function returns the same data type as the numeric data type of the argument.
See Also:
Table 3-10, "Implicit Type Conversion Matrix" for more information on implicit conversionThe following example returns the absolute value of -15:
SELECT ABS(-15) "Absolute"
  FROM DUAL;
  Absolute
----------
        15