adding more LeetCode Problems#1

ChiranjeetMandal wants to merge 1 commit intomrinal1704:mastermrinal1704/SQL-Leetcode-Challenge:masterfrom

ChiranjeetMandal:more-Leet-Code-ProblemsChiranjeetMandal/SQL-Leetcode-Challenge:more-Leet-Code-ProblemsCopy head branch name to clipboard