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CREATE TABLE orders ( ORDER_ID INTEGER, MemberID VARCHAR(1), OrderDate DATETIME ); INSERT INTO orders (ORDER_ID, MemberID, OrderDate) VALUES ('1', 'a', '2016-06-05'), ('2', 'b', '2016-06-06'), ('3', 'a', '2017-06-06'), ('4', 'b', '2017-06-07'), ('5', 'h', '2017-06-07'), ('6', 'a', '2018-06-08'), ('7', 'b', '2018-06-03'), ('8', 'a', '2019-06-05'), ('9', 'b', '2019-06-09');
9 rows affected
SELECT (year(orderDate)/2) * 2 as the_year, count(o.order_id) as Order_Count FROM orders o Group by (year(orderDate)/2) * 2
the_year
Order_Count
2016
5
2018
4