Sejf TO_NUMBER()

Z Oracle Database 12c Release 2 możesz użyć TO_NUMBER z DEFAULT ... ON CONVERSION ERROR :

SELECT TO_NUMBER('*' DEFAULT 0 ON CONVERSION ERROR) AS "Value"
FROM DUAL;

Lub CAST :

SELECT CAST('*' AS NUMBER DEFAULT 0 ON CONVERSION ERROR) AS "Value"
FROM DUAL;

db<>demonstracja skrzypiec