言語によって null や空文字の扱いは異なることがあります。 以下に例を示します。（★は注意が必要です） ポイントは3つです。 ・VB.NET では、String 型の等価／不等価演算子は Nothing と空文字を等しいと判断します。 ・JavaScript では、非厳密演算子は null と ...

SELECT * FROM employees WHERE department = 'Sales' AND salary > 100000 AND salary IS NOT NULL; This corrected query explicitly checks if the `salary` is not NULL before comparing it to the threshold.

DuckDB CLI prints SQL NULL values as "NULL" in columns in CSV output instead of as an empty string without quotes between delimiters. Argument -nullvalue has no effect. For example, for the query ...

Learn to change the default behavior and return HTTP 404 when action methods in ASP.NET Core return null values. ASP.NET Core MVC is the .NET Core counterpart of the ASP.NET MVC framework. You can ...

Null pointer exceptions are no fun. You can avoid them and keep your code clean and maintainable by using these techniques to elegantly handle null values in C#. When working on applications in any ...