pivot - Group by with UNION in Mariadb -


i have query:

select  item_code, item_name, first, second, third, `fourth` (             (select t.item_code, i.item_name, t.actual_qty `first`, '' `second`, '' `third`, '' `fourth` tabbin t join `tabitem` on i.name = t.item_code t.warehouse = "finished goods")             union              (select t.item_code, i.item_name, '' `first`, t.actual_qty `second`, '' `third`, '' `fourth` tabbin t join `tabitem` on i.name = t.item_code t.warehouse = "tank 01 - 1200 kg")             union              (select t.item_code, i.item_name, '' `first`, '' `second`, t.actual_qty `third`, '' `fourth` tabbin t join `tabitem` on i.name = t.item_code t.warehouse = "tank 02 - 1200 kg")             union              (select t.item_code, i.item_name, '' `first`, '' `second`, '' `third`, t.actual_qty `fourth` tabbin t join `tabitem` on i.name = t.item_code t.warehouse = "tank 03 - 1200 kg")) temp             group temp.item_code, temp.item_name, temp.first, temp.second, temp.third, temp.fourth

and output:

item_code  item_name  first, second, third, fourth fg-plu        plum                         30.000000 fg-plu        plum                  40.000000    fg-plu        plum           10.000000       fg-plu        plum   1248.00

i want group item_code , item_name or item_code.

this appears pivot query in disguise. use max case expressions output want:

select     t.item_code,     i.item_name,     max(case when t.warehouse='finished goods'    t.actual_qty end) first,     max(case when t.warehouse='tank 01 - 1200 kg' t.actual_qty end) second,     max(case when t.warehouse='tank 02 - 1200 kg' t.actual_qty end) third,     max(case when t.warehouse='tank 03 - 1200 kg' t.actual_qty end) fourth tabbin t inner join tabitem     on i.name = t.item_code group     t.item_code,     i.item_name

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