Add #1789 Primary Department for Each Employee

Author: dgper13

#1789 Primary Department for Each Employee.sql

@@ -0,0 +1,8 @@
+SELECT employee_id, department_id
+FROM employee
+WHERE employee_id IN (
+    SELECT employee_id
+    FROM employee
+    GROUP BY employee_id
+    HAVING primary_flag = 'Y' OR COUNT(*) = 1
+);