teradata sql中的数据透视表

Question

我有这样的数据：

ID      Result
1       value1
2       value1
2       value2
3       value1
4       value1
4       value2
4       value3

如何在 teradata SQL 中像 Excel 中一样完成数据透视表。

ID Value1                    Value2                    ...  
1  count of Value1 for ID 1  count of Value2 for ID 1  ...
2  count of Value1 for ID 2  count of Value2 for ID 1  ...
3  ...                       ...                       ...

假设有大量的 ID 和不同数量的值。

Answer 1

SELECT sum(case when Result='Value1' then ID end) "Value1"
     , sum(case when Result='Value2' then ID end) "Value2"
FROM your_table
GROUP BY null;

恐怕这里不能添加太多上下文，除了这是可以在 TD 到 v15.x 之前实现枢轴的方式

Answer 2

所以我找到了答案，我想和你分享 首先，您需要重新计算数据以了解 id||Value 的计数

CREATE TABLE myTable_count as (
SELECT ID, Result, count(1) as countOfResult
FROM myTable 
group by  ID, Result
) WITH DATA 

然后你可以做一个pivot，但你必须知道结果的名称

 SELECT ID,
 sum(CASE WHEN  Result='Value1' then countOfResult else NULL END) Value1,
 sum(CASE WHEN  Result='Value2' then countOfResult else NULL END) Value2
 FROM myTable_count
 GROUP BY ID;

如果它帮助你给它投票。

Answer 3

SELECT 
  id, 
  count(
    CASE WHEN result1 = 'value1' THEN id END
  ) AS value1, 
  COUNT(
    CASE WHEN result1 = 'value2' THEN id END
  ) AS value2, 
  COUNT(
    CASE WHEN result1 = 'value3' THEN id END
  ) as value3 
FROM 
  pivot_tb1 
group by 
  1;