[MySQL][LeetCode][Hard] 185. Department Top Three Salaries

心得

這題是 184. Department Highest Salary 的衍生題,但如果直接套用其方法的話會TimeOut,不過還是記錄一下方法:

問題

The Employee table holds all employees. Every employee has an Id, and there is also a column for the department Id.

The Department table holds all departments of the company.

Write a SQL query to find employees who earn the top three salaries in each of the department. For the above tables, your SQL query should return the following rows.

答案

  1. 這個方法是在Top Solutions看到的,在WHERE裡面統計有幾個其他同部門的人大於自己的薪水,把小於三個的都列出來,就是答案。
  2. 同上,只是改成WHERE IN效能較佳

     


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