Learn how to optimize SQL queries for NULL values by following some best practices and techniques, such as using IS NULL or IS NOT NULL operators, avoiding NOT IN with NULL values, and more.

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When SET ANSI_NULL_DFLT_ON is ON, new columns created by using the ALTER TABLE and CREATE TABLE statements allow null values if the nullability status of the column is not explicitly specified.

Is your SQL drawing a blank? It’s NULL a surprise! The title of this post is a play on words, but very appropriate. We are going to discuss the inconsistent results, as well as performance ...

For more information about using the NOT NULL WITH DEFAULT value, see your DB2 SQL reference manual. Knowing whether a DB2 column allows NULLs, or whether the host system supplies a default value for ...

For example, comparing NULL to any value, including another NULL, always returns unknown, not true or false. Secondly, you must grasp the impact of NULL on various SQL operations.

So I have a method:int Foo()It either returns a value if successful or NULL if not. If I'm not mistaken, if I try something like:int bar; bar = Foo();and Foo() returns NULL, then my program will ...