Question

我有来自指纹传感器的这张表，我需要在一行中显示结果

ID |  DateTime                | Flag
----------------------------------------
41 |  2017-02-22 08:05:56.000 | I
41 |  2017-02-22 18:11:03.000 | O

结果需要这样：

ID |  IN-DateTime             |  OUT-DateTime           
--------------------------------------------------------
41 |  2017-02-22 08:05:56.000 | 2017-02-22 18:11:03.000

任何人都可以帮助我吗？

Answer 1

简单聚合应该：

select id,
    max(case when flag = 'I' then datetime end) indatetime,
    max(case when flag = 'O' then datetime end) outdatetime
from t
group by id;

或者如果需要，可以使用pivot：

select id, [I] indatetime, [O] outdatetime
from t pivot (
    max(datetime) for flag in ([I],[O])
) as p

Answer 2

或者，您可以使用PIVOT，该ROWS专门用于将COLUMNS转换为SELECT id , [I] as [IN-DateTime] , [O] as [OUT-DateTime] FROM Table t PIVOT (max(dateTime) for flag in ([I], [O])) as pvt;。

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