note

【SQL初心者向け】NULLの落とし穴：空白との違いを徹底解説

SQLを書いていて「おかしいな、ちゃんと条件を書いてるのに結果が返ってこない…」と思ったことはありませんか？ もしかするとその原因は、「NULLと空白の違い」にあるかもしれません。 この2つ、見た目では似ていても、SQLの中ではまったく異なる存在 ...
IEEE

Handling Null Values in SQL Queries on Relational Databases

Abstract: The lack of information within relational databases expressed as NULL values presents a problem in ensuring the quality of data and the information retrieved by SQL queries. This is so ...
GitHub

Unexpected Results with NULL Values in SQL WHERE Clause

This repository demonstrates a common SQL query error related to handling NULL values in comparison conditions. The bug.sql file contains a query that unintentionally ...
GitHub

Checking Null Values in SQL for customer churn data.sql

SUM(CASE WHEN Gender IS NULL THEN 1 ELSE 0 END) AS Gender_Null_Count, SUM(CASE WHEN Age IS NULL THEN 1 ELSE 0 END) AS Age_Null_Count, SUM(CASE WHEN Married IS NULL ...
ZDNet

Handling null in .NET

Null or nonexistent data gets complicated when the application expects a data value and gets nothing or unexpected values; that's when you must perform coding that properly handles these situations to ...