Update SQL queries for date filtering questions

SQL Deep Dive/Date Filtering/questions.sql

@@ -4,37 +4,38 @@
 * Question: Get me all the employees above 60, use the appropriate date functions
 */
 
-SELECT * FROM employees;
+SELECT AGE(birth_date),* FROM employees WHERE (EXTRACT (YEAR FROM AGE(birth_date)) > 60;
+SELECT count(birth_date) FROM employees WHERE birth_date < now() - interval '61 years';
 
 /*
 * DB: Employees
 * Table: employees
 * Question: How many employees where hired in February?
 */
 
-SELECT * FROM employees;
+SELECT count(emp_no) FROM employees WHERE (EXTRACT (MONTH FROM emp_no)) = 2;
 
 /*
 * DB: Employees
 * Table: employees
 * Question: How many employees were born in november?
 */
 
-SELECT * FROM employees;
+SELECT count(birth_date) FROM employees WHERE EXTRACT(MONTH FROM birth_date) = 11;
 
 /*
 * DB: Employees
 * Table: employees
 * Question: Who is the oldest employee? (Use the analytical function MAX)
 */
 
-SELECT * FROM employees;
+SELECT max((AGE(birth_date)) FROM employees;
 
 /*
 * DB: Store
 * Table: orders
 * Question: How many orders were made in January 2004?
 */
 
-SELECT * FROM orders;
+SELECT count(orderid) FROM orders where DATE_TRUNC('month', orderdate) = date '2004-01-01';