Pregunta de entrevista de GetYourGuide

1. MySQL Queries - (Department / Employees table)JOINS, GROUP BYs, OPTIMIZING(EXPLAIN / INDEXING) 2. ALGORITHM TO GO THROUGH A FILE WITH URLS TO LOOK FOR DUPLICATES 3. ARCHITECTURE - couldn't phrase the question right, i feel the question could have been asked differently or in a good way to show what they are leaning to - Interfaces, Abstract Classes, Traits