SQL NULL Values

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In SQL, a null value is a value that does not have a specific or valid value. In other words, a null value represents the absence of a value in a specific column. It is important to note that a null value is different from a zero value or an empty string.

There are several ways to work with null values in SQL. Here are some of them:

  • IS NULL: This clause is used to search for null values in a specific column. For example, if we want to find all employees whose salary is null, we could use the following query:
SELECT * 
FROM Employees 
WHERE Salary IS NULL;
  • IS NOT NULL: This clause is used to search for values that are not null in a specific column. For example, if we want to find all employees whose salary is not null, we could use the following query:
SELECT * 
FROM Employees 
WHERE Salary IS NOT NULL;

This is all about null values in SQL. If you need more information about it, leave a comment on the post.

Have a good day, everyone!

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