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2010. The Number of Seniors and Juniors to Join the Company II
Description
Table: Candidates
+++  Column Name  Type  +++  employee_id  int   experience  enum   salary  int  +++ employee_id is the column with unique values for this table. experience is an ENUM (category) of types ('Senior', 'Junior'). Each row of this table indicates the id of a candidate, their monthly salary, and their experience. The salary of each candidate is guaranteed to be unique.
A company wants to hire new employees. The budget of the company for the salaries is 70000
. The company's criteria for hiring are:
 Keep hiring the senior with the smallest salary until you cannot hire any more seniors.
 Use the remaining budget to hire the junior with the smallest salary.
 Keep hiring the junior with the smallest salary until you cannot hire any more juniors.
Write a solution to find the ids of seniors and juniors hired under the mentioned criteria.
Return the result table in any order.
The result format is in the following example.
Example 1:
Input: Candidates table: ++++  employee_id  experience  salary  ++++  1  Junior  10000   9  Junior  15000   2  Senior  20000   11  Senior  16000   13  Senior  50000   4  Junior  40000  ++++ Output: ++  employee_id  ++  11   2   1   9  ++ Explanation: We can hire 2 seniors with IDs (11, 2). Since the budget is $70000 and the sum of their salaries is $36000, we still have $34000 but they are not enough to hire the senior candidate with ID 13. We can hire 2 juniors with IDs (1, 9). Since the remaining budget is $34000 and the sum of their salaries is $25000, we still have $9000 but they are not enough to hire the junior candidate with ID 4.
Example 2:
Input: Candidates table: ++++  employee_id  experience  salary  ++++  1  Junior  25000   9  Junior  10000   2  Senior  85000   11  Senior  80000   13  Senior  90000   4  Junior  30000  ++++ Output: ++  employee_id  ++  9   1   4  ++ Explanation: We cannot hire any seniors with the current budget as we need at least $80000 to hire one senior. We can hire all three juniors with the remaining budget.
Solutions

# Write your MySQL query statement below WITH s AS ( SELECT employee_id, SUM(salary) OVER (ORDER BY salary) AS cur FROM Candidates WHERE experience = 'Senior' ), j AS ( SELECT employee_id, IFNULL( SELECT MAX(cur) FROM s WHERE cur <= 70000, 0 ) + SUM(salary) OVER (ORDER BY salary) AS cur FROM Candidates WHERE experience = 'Junior' ) SELECT employee_id FROM s WHERE cur <= 70000 UNION SELECT employee_id FROM j WHERE cur <= 70000;