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SQL | What's wrong with this SQL Query ? Count Distinct #sqltips

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In this SQL Tip, we write a SQL Count Distinct Query and ty to understand why it is not giving the correct results. This also highlights the importance of NULL Handling in SQL.
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Must Do Data Analytics Certifications -
Google Data Analytics Professional Certificate
Google Advanced Data Analytics Professional Certificate
Best Data Science / Analytics / SQL courses
Learn SQL Basics for Data Science Specialization
Please do not forget to like, subscribe and share.
For enrolling and enquiries, please contact us at