-- ISNULL() function replaces NULL with a specified value. -- The ISNULL() function returns the replacement if the expression evaluates to NULL. -- Before returning a value, it implicitly converts the ...
> 原文:[https://www . geesforgeks . org/is numeric-and-is null-function in-ms-access/](https://www.geeksforgeeks.org/isnumeric-and-isnull-function-in-ms-access ...