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How to implement ISNUMERIC function in SQL *Plus ?

April 26, 2017function implement sql

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How to implement ISNUMERIC function in SQL *Plus ?

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Method 1: Select length (translate (trim (column_name),’ +-.0123456789′,’ ‘)) from dual ; Will give you a zero if it is a number or greater than zero if not numeric (actually gives the count of non numeric characters) Method 2: select instr(translate(‘wwww’, ‘abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ’, ‘XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX’),’X’) FROM dual; It returns 0 if it is a number, 1 if it is not.