SQL5 problem solutions#58

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Feminto wants to merge 3 commits intosuper30admin:mainfrom

Commits on May 30, 2025

Adding SQL solution for problem 4
Feminto
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Commits on Jun 3, 2025

Adding solution for AverageSalaryDepartmentvsCompany problem
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Commits on Jun 8, 2025

Adding whole SQL solution
Feminto
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