在 MS ACCESS 中使用 SELF JOIN 对多列求和

Question

I have a table - table1 like below:

+------+--------+--------+-----+

ID---hours1---hours2-----hours3--+

1-------4-------3---------2----+

2-------8-------7---------6----+

1-------5-------2---------1----+

2-------10------11--------2----+

Expected Results:

ID-----Total

1--------17

2--------44

I tried SELF join query as below:

SELECT ID, SUM(hours1 + hours2 + hours3) 
from table1 a inner join table1 b ON a.Id = b.Id 
group by a.Id

However this is giving incorrect results and results are very weird. Can anyone please help me what's wrong in above query?

Answer 1

I don't think the self-join is required for this, just:

select t.id, sum(t.hours1+t.hours2+t.hours3) as total
from table1 t
group by t.id