LeetCode中的SQL

下面记录LeetCode中所有database中的所有free题目。

爱刷题的人从不怕找不到目录：

Id	Title	Difficulty	Acceptance
595	Big Countries	Easy	71.8%
627	Swap Salary	Easy	67.0%
620	Not Boring Movies	Easy	59.2%
182	Duplicate Emails	Easy	47.3%
175	Combine Two Tables	Easy	43.5%
181	Employees Earning More Than Their Managers	Easy	40.3%
183	Customers Who Never Order	Easy	38.2%
596	Classes More Than 5 Students	Easy	31.9%
197	Rising Temperature	Easy	31.6%
196	Delete Duplicate Emails	Easy	26.4%
176	Second Highest Salary	Easy	23.7%
626	Exchange Seats	Medium	48.8%
178	Rank Scores	Medium	30.8%
180	Consecutive Numbers	Medium	28.7%
184	Department Highest Salary	Medium	23.6%
177	Nth Highest Salary	Medium	21.8%
601	Human Traffic of Stadium	Hard	33.5%
185	Department Top Three Salaries	Hard	20.6%