分组结果集数据

Question

我有一个存储过程中，我想返回结果集看起来像这样：

id | student | term1 | term2 

的问题是，数据不存储这样的分贝。因此，查询将生成一个看起来像这样的结果集：

id | student | termNo | termValue 
1 | lorem | 1  | someValue 
2 | ipsum | 2  | anotherValue 

是否有任何简单的方法来转换此。结果集很大，所以我不想做出几个明显的解决方案。

希望这是可以理解的=）

Answer 1

好，根据你的意见，你可以这样做：

SELECT id, 
     student, 
     MIN(CASE WHEN termNo = 1 THEN termValue END) term1, 
     MIN(CASE WHEN termNo = 2 THEN termValue END) term2, 
     MIN(CASE WHEN termNo = 3 THEN termValue END) term3, 
     MIN(CASE WHEN termNo = 4 THEN termValue END) term4 
FROM YourTable 
GROUP BY id, student 

或

SELECT id, student, [1] AS Term1, [2] AS Term2, [3] AS Term3, [4] AS Term4 
FROM YourTable T 
PIVOT(MIN(termValue) FOR termNo IN ([1],[2],[3],[4])) AS PT