Getting a "The sum function requires 1 argument(s)." error - select

Question

Trying to 2 values in a column together. The idea is that I get the m1, m2, and m3 values that fit the criteria; area ='000000' , ownership = '50', and code =113 or 114. The values should be 42, 40, and 44 respectively. Until now, I have been doing this in excel but am trying to take Excel out of this process. There are no NULL values involved in this.
Any idea why I am getting this error?
select sum (m1,m2,m3),
from dbo.tablename
where area='000000' and ownership='50' and (code='113' or code='114');
sample data
area ownership code m1 m2 m3
000000 50 113 40 38 42
000000 50 114 2 2 2
desired result
000000 50 113+114 42 40 44

Answer 1

In SQL, SUM(column) is an aggregate function that sums the values across different rows. If you want to add values from a single row, you can do SELECT m1 + m2 + m3 FROM.... You can also add the column values inside the rows, then sum it across rows like SUM(m1 + m2 + m3). I would re-write you query as:
SELECT SUM(m1) sum1, SUM(m2) sum2, SUM(m3) sum3
FROM dbo.tablename
WHERE area='000000' AND ownership='50' AND (code='113' OR code='114');

Answer 2

to get that specific answer as below.
desired result
area | ownership| code | m1 | m2 | m3
000000| 50 | 113+114| 42 | 40 | 44
once you want to see area and ownership this should have this columns on the sql and group by condition.
Like:
select area, ownership, sum(code), sum(m1), sum(m2), sum(m3)
from dbo.tablename
where area='000000' and ownership='50' and (code='113' or code='114')
group by area, ownership;