MYSQL combine two GROUP BY result using one command - mysql

Question

For example, I have fruit come from different country and have different brand(note that the country and brand is independence).
+-------+-------+---------+-------+
| name | stock | Country | brand |
+-------+-------+---------+-------+
| apple | 40 | USA | Sun |
| apple | 38 | UK | Sun |
| apple | 33 | CN | Green |
| apple | 29 | UK | Air |
| apple | 15 | USA | Green |
+-------+-------+---------+-------+
Normally if we use this command
SELECT name, Country, sum(stock)
FROM table
GROUP BY Country
It will give the following result
+-------+---------+------------+
| name | Country | sum(stock) |
+-------+---------+------------+
| apple | CN | 33 |
| apple | UK | 67 |
| apple | USA | 55 |
+-------+---------+------------+
But what I want is this....
+-------+----------+-------+
| name | category | stock |
+-------+----------+-------+
| apple | USA | 55 |
| apple | UK | 67 |
| apple | CN | 33 |
| apple | Sun | 78 |
| apple | Green | 48 |
| apple | Air | 29 |
+-------+----------+-------+
For some result, the command must be one step command, which means only for one command it should able to directly output the above result just one click.

Answer 1

I would suggest doing this with a subquery:
select name, category, sum(stock)
from (select name, brand as category, stock, 1 as ordering
from table
union all
select name, country, stock, 0 ordering
from table
) t
group by name, category, ordering
order by ordering, name;
Note the use of the ordering column to ensure that the results appear in the same order as in your desired results. Also, this will keep two rows in cases where the brand and country have the same name. You can remove the ordering from the group by if you want them combined.

Answer 2

try reading into unions or left join
i think you need to make
SELECT name, Country as category, sum(stock)
into #temptable1 FROM table
GROUP BY Country
and
SELECT name, brand as category, sum(stock)
into #temptable2 FROM table
GROUP BY brand
then join the two temp tables together
this can be done using stored procedures
or simply union directly without making temp tables
SELECT name, Country as category, sum(stock)
into #temptable1 FROM table
GROUP BY Country
UNION
SELECT name, brand as category, sum(stock)
into #temptable2 FROM table
GROUP BY brand