MySQL - each total sales of all items -


the following mysql query getting total sales of each item purchased user id 31 in 2014.

select      op.products_name,     round(sum( if(month(o.date_purchased) = 1, op.final_price * op.products_quantity,0)), 2) january,     round(sum( if(month(o.date_purchased) = 2, op.final_price * op.products_quantity,0)), 2) febraury,     round(sum( if(month(o.date_purchased) = 3, op.final_price * op.products_quantity,0)), 2) march,     round(sum( if(month(o.date_purchased) = 4, op.final_price * op.products_quantity,0)), 2) april,     round(sum( if(month(o.date_purchased) = 5, op.final_price * op.products_quantity,0)), 2) may,     round(sum( if(month(o.date_purchased) = 6, op.final_price * op.products_quantity,0)), 2) june,     round(sum( if(month(o.date_purchased) = 7, op.final_price * op.products_quantity,0)), 2) july,     round(sum( if(month(o.date_purchased) = 8, op.final_price * op.products_quantity,0)), 2) august,     round(sum( if(month(o.date_purchased) = 9, op.final_price * op.products_quantity,0)), 2) september,     round(sum( if(month(o.date_purchased) = 10, op.final_price * op.products_quantity,0)), 2) october,     round(sum( if(month(o.date_purchased) = 11, op.final_price * op.products_quantity,0)), 2) november,     round(sum( if(month(o.date_purchased) = 12, op.final_price * op.products_quantity,0)), 2) december orders_products op left join orders o on op.orders_id = o.orders_id customers_id = 31 , year(o.date_purchased) = 2014 group op.products_id order op.products_name

and there 2 tables used.

orders_products : orders_id, products_id, products_name...

orders : orders_id, customers_id, date_purchased

i thought left joining 2 tables give me full of nulls unpurchased items... gives me rows of purchased items. how can calculate each total sales of purchased / unpurchased items?

*update

enter image description here

first of should use left outer join. where clause reducing result. should remove where clause @ or add this:

select  op.products_name, round(sum( if(month(o.date_purchased) = 1, op.final_price * op.products_quantity,0)), 2) january, round(sum( if(month(o.date_purchased) = 2, op.final_price * op.products_quantity,0)), 2) febraury, round(sum( if(month(o.date_purchased) = 3, op.final_price * op.products_quantity,0)), 2) march, round(sum( if(month(o.date_purchased) = 4, op.final_price * op.products_quantity,0)), 2) april, round(sum( if(month(o.date_purchased) = 5, op.final_price * op.products_quantity,0)), 2) may, round(sum( if(month(o.date_purchased) = 6, op.final_price * op.products_quantity,0)), 2) june, round(sum( if(month(o.date_purchased) = 7, op.final_price * op.products_quantity,0)), 2) july, round(sum( if(month(o.date_purchased) = 8, op.final_price * op.products_quantity,0)), 2) august, round(sum( if(month(o.date_purchased) = 9, op.final_price * op.products_quantity,0)), 2) september, round(sum( if(month(o.date_purchased) = 10, op.final_price * op.products_quantity,0)), 2) october, round(sum( if(month(o.date_purchased) = 11, op.final_price * op.products_quantity,0)), 2) november, round(sum( if(month(o.date_purchased) = 12, op.final_price * op.products_quantity,0)), 2) december orders_products op left outer join orders o on op.orders_id = o.orders_id (customers_id = 31  , year(o.date_purchased) = 2014)  or o.date_purchased null group op.products_id order op.products_name

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