Milky's note

https://www.hackerrank.com/challenges/the-company/problem?isFullScreen=true New Companies | HackerRank Find total number of employees. www.hackerrank.com [문제] Amber's conglomerate corporation just acquired some new companies. Each of the companies follows this hierarchy: Given the table schemas below, write a query to print the company_code, founder name, total number of lead managers, total num..