Add advanced SQL queries #246
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Added sql-queries-advanced.sql to sql-queries directory. Includes 3 advanced SQL query examples demonstrating subquery/join, window functions, and CTE usage.
Testing
Run sql-queries-advanced.sql locally to verify queries execute correctly.
This brief description provides a clear overview of the changes, explaining what was added and how to test it. It follows best practices by being concise and informative, allowing reviewers to quickly understand the purpose and scope of the pull request.