IS NOT NULL returning NULL values?
Herein, what is null and not null?
NULL and NOT NULL are the check constraints used to specify whether the column should allow nulls or not. This can be given while creating database objects. NULL is use to check the condition with equal operator (=). Not Null is use to check the value that is null or not.
Secondly, iS NOT NULL in SQL? The IS NOT NULL condition is used in SQL to test for a non-NULL value. It returns TRUE if a non-NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.
Also, iS NOT NULL in access?
MS Access IsNull() Function The IsNull() function checks whether an expression contains Null (no data). This function returns a Boolean value. TRUE (-1) indicates that the expression is a Null value, and FALSE (0) indicates that the expression is not a Null value.
What is a null value?
The SQL NULL is the term used to represent a missing value. A NULL value in a table is a value in a field that appears to be blank. A field with a NULL value is a field with no value. It is very important to understand that a NULL value is different than a zero value or a field that contains spaces.