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Performance of checking for data in related tables

NB: this question is purely academic / to help improve my understanding of SQL Server performance. Given a master table which relates to one or more other tables, how would you determine the best ...
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Writing a Condition in a Stored Procedure Using If Exists

I have a stored procedure which is working. I want to check two condition in my stored procedure: If I found the same record in database it should not save the Record, it will return 1. If I found ...