基于标准的增量计数

Question

无论如何，我可以存档如下吗？ 基本上它需要根据主题本身来计算。

Student     Term        Subject     Count
------------------------------------------------------
0001        AUG2013     ABC1234     0
0001        Jan2014     ABC1234     1
0001        Jan2014     DEF1234     0
0001        May2014     ABC1234     2
0001        May2014     GHI1234     0

Answer 1

试试这个

SELECT
   Student,
   Term,
   Subject,
   ROW_NUMBER() OVER (PARTITION BY Student, Subject ORDER BY Term)-1 AS Count
FROM 
   TableName