Oracle to_number function pramaters

I have problems with TO_NUMBER function second and third parameters. One dependent on the other? How does the nls_params parameter? I don't understand how the result of the query

SELECT TO_NUMBER ('17,000, 23',
"999G999D99,"
' nls_numeric_characters = ",". ')
REFORMATTED_NUMBER
FROM DUAL;

can be 17000.23. Could someone please explain the above conversion process. I looked towards the top of the documentation, but it is not explanatory eneogh.

P.S. The query above is taken from a book of preperation certificate Expert Oracle database SQL.

See
TO_NUMBER problem
Re: number format

Tags: Database

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