特定組通過在SQL Server查詢

Question

初始表：

1 1 3 
1 1 4 
1 2 1 
1 2 3 
2 1 5 
2 1 2 
2 2 2 
2 2 3 

組後

通過在第三列和總和在該柱：

1 1 7 
1 2 4 
2 1 7 
2 2 5 

Answer 1

SELECT Col1, Col2, SUM(Col3) 
FROM dbo.YourTable 
GROUP BY Col1, Col2 

東西 那樣??

Answer 2

指定多個列由組，它只會當組中的所有列中的值是相同的：

SELECT ColA, ColB, Sum(ColC) as Summation 
FROM YourTable 
GROUP BY ColA, ColB 

Answer 3

 
    select one , two, sum(three) from (
    select 1 as one, 1 as two, 3 as three from dual 
    union 
    select 1 as one, 1 as two, 4 as three from dual 
    union 
    select 1 as one, 2 as two, 1 as three from dual 
    union 
    select 1 as one, 2 as two, 3 as three from dual 
    union 
    select 2 as one, 1 as two, 5 as three from dual 
    union 
    select 2 as one, 1 as two, 2 as three from dual 
    union 
    select 2 as one, 2 as two, 2 as three from dual 
    union 
    select 2 as one, 2 as two, 3 as three from dual 
) group by one, two;