Update Project Employees.md

Update 0_General SQL tips and tricks.md

Update Invalid Tweets.md

Update 0_General SQL tips and tricks.md

Update 0_General SQL tips and tricks.md

Update Restaurant Growth.md

Update Managers with at least 5 direct reports.md

Update Second Highest Salary.md

Update Find Users With Valid E-Mails.md

Create Find Users With Valid E-Mails.md

Update List The Products Ordered In a Period.md

Create List The Products Ordered In a Period.md

Create Draw The Triangle 2 (Hackerrank).md

Create Department Top 3 Salaries.md

Create User Activity For The Last 30 Days.md