SQL SERVER – How to Count a Particular Value Across All Columns?

This question came up in the recent SQL Server Performance Tuning Practical Workshop. During the workshop, I have answer questions of users during lunch break. One of the users had a very interesting scenario where he had to change one of their employee’s email address for technical reasons but before he changes that he needed to count in every single place where the email exists. I have simulated the same situation in this blog post and we will see how we can count a particular value across all the columns of the table.

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