向视图添加总计

Question

new to SQL and I'm looking to do some work with income per month and quarterly/annual totals.

I have a mock view which pulls information from a company table (giving us company ID and CompanyName) and an income table (giving us the remaining 4 columns) like this:

CompanyID |CompanyName |IncomeType  |Jan   |Feb   |Mar
-----------------------------------------------------------    
1         |Big Stuff   |Cars        |1000  |200   |500 
2         |Huge Stuff  |Lorries     |2000  |4000  |5000

What I'd like is to be able to sum Jan+Feb+Mar as a Total column per CompanyID .

I'm having problems with including the sum(J+F+M) as first SQL asks for a group on the companyID , then once that's grouped, it asks for grouping on CompanyName and so on.

Any help gratefully received.

Answer 1

Maybe this...

SELECT C.companyID, C.CompanyName, C.IncomeType, sum(Jan) J , sum(Feb) F, 
       sum(Mar) M, sum(Jan+Feb+Mar) as Total
FROM company C
INNER JOIN Income I
  on  C.CompanyID = I.CompanyId
GROUP BY C.companyID, C.CompanyName, C.IncomeType

Answer 2

You don't need the sum() , unless you have an aggregation query already. So, something like:

select c.companyID, c.CompanyName, i.IncomeType, i.Jan, i.Feb, i.Mar,
       (i.Ja + i.Feb + i.Mar) as Total
from company c join
     income i
     on c.companyid = i.companyid;