MySQL UNION does not seem to work correctly -

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i have sql query using pull data orders database. querying 2 tables , combining results using union all. however, union not seem work expected. here query using:

select year(oc_order.date_added) year, count(oc_order.order_id) cnt, sum( ifnull(oc_order.new_total,oc_order.total) ) total oc_order oc_order.order_status_id in (1,3,5)     , month(oc_order.date_added) between '01' , '02'     , day(oc_order.date_added) between '01' , '31' group year(oc_order.date_added)  union  select ifnull(year(str_to_date(oc_return_custom.date_added,'%d-%m-%y %h:%i:%s')),year(str_to_date(oc_return_custom.date_added,'%y-%m-%d %h:%i:%s')) ) year, count(oc_return_custom.return_id) cnt, sum( oc_return_custom.total ) total oc_return_custom ifnull(month(str_to_date(oc_return_custom.date_added,'%d-%m-%y %h:%i:%s')),month(str_to_date(oc_return_custom.date_added,'%y-%m-%d %h:%i:%s')) ) between '01' , '02'     , ifnull(day(str_to_date(oc_return_custom.date_added,'%d-%m-%y %h:%i:%s')),day(str_to_date(oc_return_custom.date_added,'%y-%m-%d %h:%i:%s')) ) between '01' , '31' group ifnull(year(str_to_date(oc_return_custom.date_added,'%d-%m-%y %h:%i:%s')),year(str_to_date(oc_return_custom.date_added,'%y-%m-%d %h:%i:%s')) ) order year desc

this query:

+=======+========+=======+ | year  | cnt    | total | +=======+========+=======+ | 2016  |  200   |  1000 | | 2016  |   50   |   200 | | 2015  |  100   |   800 | | 2015  |   10   |    50 | +=======+========+=======+

but wanted get:

+=======+========+=======+ | year  | cnt    | total | +=======+========+=======+ | 2016  |  250   |  1200 | | 2015  |  110   |   850 | +=======+========+=======+

can tell me doing wrong???

notes: oc_order table's date_added column datetime whereas oc_return_custom 's date_added column text.

union all puts 2 data sets produced separate group by operations.

to expected result set have wrap query in subquery , apply additional group by:

select year, sum(cnt) cnt, sum(total) total ( ... query here ...) t group year

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