Many times we come across null values within tables in SQL Server. Null values are the values with no data; that means the data is missing or unknown. In this article, initially we will understand the SQL Server IsNull function, then we will move towards extending the IsNull functionality using Coalesce function.
source https://www.c-sharpcorner.com/Blogs/sql-server-isnull-with-multi-column-names
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