Yurttas/PL/DBL/postgres/F/01/Bank/a04.sql

 1/*
 2REM
 3REM a04.sql
 4REM
 5REM Find the average balance of all depositors
 6REM who live in Harrison and have at least 3 accounts.
 7REM
 8*/
 9 
10SELECT current_schema();
11SET search_path to "bank";
12
13SELECT AVG(balance)
14FROM Depositor, Customer
15WHERE Depositor.customername = Customer.customername
16  AND Customer.customercity = 'Harrison'
17GROUP BY Depositor.customername
18HAVING COUNT(accountnumber) >= 3;