Question

I am trying to write an SQL statement that would allow me to retrieve all the orders created in the month of September without much luck.

Not working:

select order_number, created_date
from orders
where created_date in to_date('2012-09', 'YYYY-MM');

Working but too long:

select order_number, created_date
from orders
where trunc(created_date) between to_date('2012-09-01', 'YYYY-MM-DD') and to_date('2012-09-30', 'YYYY-MM-DD');

Answer 1

How about:

select order_number, created_date
from orders
where created_date >= to_date('2012-09-01', 'YYYY-MM-DD') 
and created_date < to_date('2012-10-01', 'YYYY-MM-DD');

You should try to leave created_date untouched to make sure that you can leverage indexes on it nicely.