获取表中唯一值的显示次数

Question

我有一张这样的表：

Email | Number
a     |  0.5
a     |  1
a     |  1.1
b     |  5
b     |  3.7

我想保留相同的表格布局，但要根据“数字”列的排名顺序获取唯一电子邮件的实例编号：

Email | Number | RankOrder
a     |  0.5   |  3
a     |  1     |  2
a     |  1.1   |  1
b     |  7.7   |  1
b     |  6     |  2

Answer 1

如果我理解正确，你需要row_number()函数（这是大多数数据库中可用的ANSI标准函数）：

select email, number,
        row_number() over (partition by email order by number desc) as rankorder
from t;

Answer 2

您可以使用窗口Row_Number()：

执行此操作

Select  Email, Number,
        Row_Number() Over (Partition By Email Order By Number Desc) As RankOrder
From    LikeSo;