NULL Tag Archives

SQL COALESCE Function and NULL

Knowing when to use the SQL COALESCE function is a lifesaver when you’re dealing with NULL. As you know, NULL is a tricky concept, and it seem what ever NULL “touches” in an expression, it renders the result NULL. So, when you’re dealing with NULL, how can you break out of the cycle? That is, […]

How to use the SQL IN Operator with an Expression List

In this video we’ll walk you though how to use the SQL IN operator; we’ll show you why you would want to use the IN operator and how to avoid some pitfalls associated with NULL. The SQL IN operator matches a column to a list. Once you’ve gone through this article, I would recommend watching […]

What is a Database NULL Value?

What is a Null Value? In databases a common issue is what value or placeholder do you use to represent a missing values. In SQL, this is solved with null. It is used to signify missing or unknown values. The keyword NULL is used to indicate these values. NULL really isn’t a specific value as much as it […]