用于对重复行进行求和并保留重复行的SQL代码

Question

如何编写SQL查询

A        1    
B        1    
C        1    
A        1    
A        1    
B        1    
B        1    
C        1    
B        1

使其看起来像

A      3
B      4
C      2
A      3
A      3
B      4
B      4
C      2
B      4

Answer 1

SELECT field1, SUM(field2) OVER (PARTITION BY field1) as total
FROM table1

有关Oracle中窗口/分析函数的更多信息：http://docs.oracle.com/cd/E11882_01/server.112/e41084/functions004.htm