Comparing Missing Values
Learn how to compare NULL values in SQL.
We'll cover the following
Overview
Before we start analyzing data, we usually need to clean it first. Data cleaning is an important part of this process, and handling missing values is a large part of that.
Missing data in SQL
Missing data in SQL is represented by the special value NULL
. We already know that some functions, such as aggregate functions, handle NULL
values differently. For example:
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