Use IFNULL: IFNULL(expr1, 0). From the documentation: If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2. ... <看更多>

Java Swings consultants and developers - Jaspersoft Studio Reports consultants and developersPing me on ... ... <看更多>

'' is an empty string, it's not a NULL value. Other DBMS would rightfully reject your update statement in the first place (because it's ... ... <看更多>