Convert the string to a number and pass the format string $99,999.99 to TO_NUMBER()
SQL>
SQL> -- Convert the string to a number and pass the format string $99,999.99 to TO_NUMBER():
SQL>
SQL> SELECT TO_NUMBER('-$12,345.67', '$99,999.99') FROM dual;
TO_NUMBER('-$12,345.67','$99,999.99')
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-12345.67
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