diff --git a/1789-primary-department-for-each-employee/1789-primary-department-for-each-employee.sql b/1789-primary-department-for-each-employee/1789-primary-department-for-each-employee.sql
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index 0000000..43f9538
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+++ b/1789-primary-department-for-each-employee/1789-primary-department-for-each-employee.sql
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+# Write your MySQL query statement below
+SELECT employee_id, department_id FROM Employee GROUP BY employee_id HAVING COUNT(department_id) = 1 UNION SELECT employee_id, department_id FROM Employee WHERE primary_flag = 'Y'
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