isnumeric Python String isnumeric() function returns True if all the characters in the string are numeric, otherwise False. If the string is empty, then this function returns False. 如果字符串中的所有字符均为数字,则Python String isnumeric&#x…
1. 利用 to_number CREATE OR REPLACE FUNCTION isnumeric ( str IN VARCHAR2 ) RETURN NUMBER IS v_str FLOAT ; BEGIN IF str IS NULL THEN RETURN 0 ; ELSE BEGIN SELECT TO_NUMBER ( str ) INTO v_str FROM DUAL; EXCEPTION WH…