task 25

Author: BEPb

tasks/25.sql

@@ -0,0 +1,13 @@
+SELECT
+    c.company_code,
+    c.founder,
+    COUNT(DISTINCT l.lead_manager_code),
+    COUNT(DISTINCT s.senior_manager_code),
+    COUNT(DISTINCT ma.manager_code),
+    COUNT(DISTINCT e.employee_code)
+FROM company c
+    RIGHT JOIN lead_manager l ON l.company_code = c.company_code
+    RIGHT JOIN senior_manager s ON s.company_code = c.company_code
+    RIGHT JOIN manager ma ON ma.company_code = c.company_code
+    RIGHT JOIN employee e ON e.company_code = c.company_code
+GROUP BY c.company_code, founder