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Primary Department for Each Employee

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	`1`	`+Link: https://leetcode.com/problems/primary-department-for-each-employee/`
	`2`	`+Tool: MS SQL Server`
	`3`	`+`
	`4`	`+`
	`5`	`+`
	`6`	`+`
	`7`	`+`
	`8`	`+`
	`9`	`+select distinct e.employee_id, e.department_id`
	`10`	`+from Employee e`
	`11`	`+where e.primary_flag = 'Y' or`
	`12`	`+1 = (select count(department_id) from Employee where employee_id = e.employee_id);`

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