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SQL Server Database Developer | .Net Backend Developer

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Hi, I’m Amir Abdollahi, a SQL Server Database Developer and .NET Backend Developer with over 7 years of experience. This blog is my space to share technical insights, lessons I’ve learned, and practical tips from my journey in the world of databases and backend development.

Whether you’re a fellow developer, a DBA, or someone just starting out in the field, I hope my experiences can help you solve problems and grow your skills. Feel free to explore the blog, leave comments, or connect with me. I’d love to hear your thoughts and learn from your experiences too!

Performance Comparison: LEFT JOIN + IS NULL vs. NOT EXISTS

T-SQL

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