Group by month including empty months

Question

I want to select all my order values per month. I know this works fine with GROUP BY month but only with months with orders in it. Now I want also the months with no orders

Answer 1

After searching for a simple solution i finally found this which I think is SIMPLE. This will show last year and this years sales side by side.

select 
       date_format(current_date - INTERVAL 1 YEAR,'%Y') as LAST_YR,
       date_format(NOW(),'%Y') as THIS_YR,
       monthname(date) as month,
       sum(case when year(date) = date_format(current_date - INTERVAL 1 YEAR,'%Y') then amount else 0 end) as sales_ly,
       sum(case when year(date) = DATE_FORMAT(NOW(),'%Y') then amount else 0 end) as sales_ty
from tablename
where date between date_format(current_date - INTERVAL 1 YEAR,'%Y-%01-%01')
and date_format(current_date, '%Y-%12-%31')
group by monthname(date)
order by max(month(date));