https://leetcode.com/problems/primary-department-for-each-employee/description/
Primary Department for Each Employee - LeetCode
Can you solve this real interview question? Primary Department for Each Employee - Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview.
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# Write your MySQL query statement below
(select employee_id, department_id
from Employee
where primary_flag = 'Y' )
union
(select employee_id, department_id
from Employee
group by employee_id
having count(department_id) = 1)
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cs |
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