Update code.md

datahubber · Aug 10, 2023 · de54b44 · de54b44
1 parent 988e8ca
commit de54b44
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/SQL/Advanced Select and Joins/code.md b/SQL/Advanced Select and Joins/code.md
@@ -22,3 +22,16 @@ FROM Employees e
 WHERE
     salary < 30000 AND manager_id NOT IN (select employee_id from employees as c)
 order by employee_id
+
+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(employee_id) = 1