add 1789

Author: fishercoder1534

database/_1789.sql

@@ -0,0 +1,5 @@
+-- # Write your MySQL query statement below
+select employee_id, department_id
+from (select *, count(employee_id) over(partition by employee_id) as EmployeeCount from Employee) EP
+where EmployeeCount = 1
+   or primary_flag = 'Y';

paginated_contents/database/README.md

@@ -2,6 +2,7 @@
 |------|----------------|-----------------------------------------------------------------------------------------------------------------------|---------------|---------------|-------------
 | 3198 |[Find Cities in Each State](https://leetcode.com/problems/find-cities-in-each-state/)| [Solution](https://github.com/fishercoder1534/Leetcode/blob/master/database/_3198.sql)                                || Easy |
 | 3172 |[Second Day Verification](https://leetcode.com/problems/second-day-verification/)| [Solution](https://github.com/fishercoder1534/Leetcode/blob/master/database/_3172.sql)                                || Easy |
+| 1789 |[Primary Department for Each Employee](https://leetcode.com/problems/primary-department-for-each-employee/)| [Solution](https://github.com/fishercoder1534/Leetcode/blob/master/database/_1789.sql)                                || Easy |
 | 1757 |[Recyclable and Low Fat Products](https://leetcode.com/problems/recyclable-and-low-fat-products/)| [Solution](https://github.com/fishercoder1534/Leetcode/blob/master/database/_1757.sql)                                || Easy |
 | 1741 |[Find Total Time Spent by Each Employee](https://leetcode.com/problems/find-total-time-spent-by-each-employee/)| [Solution](https://github.com/fishercoder1534/Leetcode/blob/master/database/_1741.sql)                                || Easy |
 | 1729 |[Find Followers Count](https://leetcode.com/problems/find-followers-count/)| [Solution](https://github.com/fishercoder1534/Leetcode/blob/master/database/_1729.sql)                                || Easy |