Update iqsql.md

Added a new question to the list- Average Salary: Departments VS Company

Author: thecoddiwompler

iqsql.md

@@ -1,15 +1,16 @@
-1. Child - Parent - Grandparent Hierarchy
-2. Clocked Hours
-3. Department Top 3 Salary
-4. Employees Check-in Details
-5. Employees Hiring [Difficult]
-6. Employees Log [Extra Difficult]
-7. Final Destination
-8. Highest-Grossing Items
-9.  Increasing Sales Revenue
-10. Last Person to Fit in the Bus
-11. Manager with at least 5 direct reportees
-12. Mismatched IDs
-13. Odd and Even Measurements
-14. Onboarded Cities
-15. Qualifying Criteria
+1. Average Salary: Departments VS Company
+2. Child - Parent - Grandparent Hierarchy
+3. Clocked Hours
+4. Department Top 3 Salary
+5. Employees Check-in Details
+6. Employees Hiring [Difficult]
+7. Employees Log [Extra Difficult]
+8. Final Destination
+9. Highest-Grossing Items
+10.  Increasing Sales Revenue
+11. Last Person to Fit in the Bus
+12. Manager with at least 5 direct reportees
+13. Mismatched IDs
+14. Odd and Even Measurements
+15. Onboarded Cities
+16. Qualifying Criteria