Add SQL’s Not operator to find values that aren’t Null. Using Northwind, the sample database that comes with Access, I will create a few queries to illustrate using Is Null and Is Not Null.

For example, if you are working with a SQL database, you can use a data validation framework like Great Expectations to define and test data quality expectations, such as expect_column_values_to ...

NULL values have been present in databases since almost the earliest implementations of relational database management systems, but the implementation of the SQL standard raises multiple problems.

This repository contains SQL practice exercises focused on handling 'NULL' values using functions like 'IFNULL()','ISNULL()' etc. The exercises are based on a case study provided by BRightLght ...

Null values have the potential to wreak havoc on calculations, leading to inaccuracies in financial reports. Take, for instance, the calculation of total balance from debit and credit columns.