ror_coding

출력해야 하는 항목을 고정시킬 때, union all과 select 을 써서 left/right join 을 해야합니다. Question Write a solution to calculate the number of bank accounts for each salary category. The salary categories are:"Low Salary": All the salaries strictly less than $20000."Average Salary": All the salaries in the inclusive range [$20000, $50000]."High Salary": All the salaries strictly greater than $50000.The result table ..

limit 1 offset 1; Question Write a solution to find the second highest distinct salary from the Employee table. If there is no second highest salary, return null (return None in Pandas).The result format is in the following example. Table: Employee +-------------+------+ | Column Name | Type | +-------------+------+ | id | int | | salary | int | +-------------+------+ id is the ..