How to handle NULL (empty fields) and common pitfalls

For those new to data analysis, I will explain how to handle NULL (empty fields), where mistakes are most common in SQL, using concrete examples and results. Understanding NULL will help you solve ...
TechRepublic

Learn the differences between Is Null and IsNull() in Access

How many null values exist? What is the difference between a null value and a blank entry? This article answers those questions and more by discussing what to look for when creating Access apps that ...

[Code Philosophy Essay] null is not 'nothing' but 'not yet decided' — I left the empty values unfilled

There is a field left emptyOctober 14, 2026. Wednesday. A field on the screen remains empty. In the code, that emptiness is null.There were nights when I read null as nothing. If it is nothing, I ...
TechRepublic

10 tricks for handling null values in Microsoft Access

Null values indicate that data is missing or unknown, and if you don’t take steps to handle them, you could wind up with runtime errors or erroneous data. These Access pointers will help you ...
Nature

Microsatellite null alleles in parentage analysis

Null alleles have posed recurring challenges for population genetics following the introduction and application of each new method of molecular assay (including serological typing, protein ...
Investopedia

Understanding Null Hypothesis in Investment Analysis

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...