MySQL：获取每行的总数，然后获取每个“分组依据”的总数

Question

Sorry about the title, I don't know what's the proper term to use.

I have this data:

I want to produce a table something like this:

I want to get the total of each 'group by' and I'm doing this code but I'm getting wrong total.

SELECT code, (a * b)
AS total_each_code
FROM  table1   
GROUP BY code 

UPDATE: updated photos of sample data, sorry for typos.

Answer 1

you can use sub query for this

select code, sum(a.total_each_code)
         from (
            SELECT code, (a * b)
                AS total_each_code
                FROM  table1   order by code
                )a 
        group by a.total_each_code

or just simple as

select code,sum(a*b) as total from table1 group by code.

Answer 2

Use sum() aggregation

SELECT code, sum(a * b)
AS total_each_code
FROM  table1   
GROUP BY code