我需要SQL Server 2008 R2中的查詢

Question

我有一個名爲Table1的表，它包含4列。

對於前：

id Field1 Field2 fIELD3 
1 A  1  R1 
2 A  1  R2 
3 B  3  R21 
4 A  1  R3 
5 B  3  R44 

我需要一個查詢，讓我這個結果

Field1 Field2 
A  1 
B  3 

Answer 1

Select Distinct Field1, Field2 
from Table1 

Answer 2

SELECT DISTINCT Field1,Field2 FROM TABLE_NAME 

Answer 3

方法1：

SELECT Field1, Field2 
from Table1 
Group BY Field1, Field2 

方法2：

Select Distinct Field1, Field2 
From Table1 

方法3：

Select Field1, Field2 
From 
    (
     Select Field1, Field2,Row_NUmber() Over(Partition by Field1, Field2 Order By Field1) AS RN 
    ) AS T 
Where RN = 1