teradata sql 将多个匹配项转置为其他列 [英] teradata sql pivot multiple occurrences into additional columns

问题描述

我有这样的事情:

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

我想返回这样的东西:

ID      Result1      Result2      Result3
1       value1
2       value1       value2
3       value1
4       value1       value2       value3

我搜索了枢轴、连接和中断，但找不到简单、明智的解决方案.

I've searched on pivots and concats and breaks and I just can't find a simple, sensible solution.

TIA

推荐答案

很遗憾，Teradata 没有 PIVOT 函数，但您可以使用带有 CASE 表达式的聚合函数来获取结果.

Unfortunately Teradata doesn't have a PIVOT function but you can use an aggregate function with a CASE expression to get the result.

select id,
    max(case when seq =1 then result end) result1,
    max(case when seq =2 then result end) result2,
    max(case when seq =3 then result end) result3
from
(
    select id, res, row_number() over(partition by id order by result) seq
    from yourtable
) d
group by id
order by id;

如果每个 ID 有更多值，则可以添加更多 CASE 表达式.

If you have more values for each ID, then you can add more CASE expressions.

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