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NLS_LANGUAGE specifies the default conventions for the following session characteristics:
Language for server messages
Language for day and month names and their abbreviations (specified in the SQL functions TO_CHAR and TO_DATE)
Symbols for equivalents of AM, PM, AD, and BC. (A.M., P.M., A.D., and B.C. are valid only if NLS_LANGUAGE is set to AMERICAN.)
Default sorting sequence for character data when ORDER BY is specified. (GROUP BY uses a binary sort unless ORDER BY is specified.)
Writing direction
Affirmative and negative response strings (for example, YES and NO)
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