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Oracle® Database SQL Language Reference
11g Release 1 (11.1)

B28286-07
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Sorting Query Results

Use the ORDER BY clause to order the rows selected by a query. Sorting by position is useful in the following cases:

The mechanism by which Oracle Database sorts values for the ORDER BY clause is specified either explicitly by the NLS_SORT initialization parameter or implicitly by the NLS_LANGUAGE initialization parameter. You can change the sort mechanism dynamically from one linguistic sort sequence to another using the ALTER SESSION statement.

See Also:

NLSSORT and Oracle Database Globalization Support Guide for information on the NLS parameters