Although suggestion is to well identify the NULL values using Python, R or SQL and check for special characters, na, NaN, NULL and blank spaces as well. …see more. Like. Like. Celebrate.

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.

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

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.