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sql - SQL Server：水平转换时间表

问题描述

我有 SQL Server 和一个简单的表，它将从考勤机自动填充：

[time_id],[time_resource_id],[time_type],[time_date],[time_hour],[time_establishment]
     1          123               in     2021-06-19     8:00          1
     2          123               out    2021-06-19     10:00
     3          123               in     2021-06-19     13:00

我想把它转换成类似的东西

time_resource_id,   time_date         t1 ,       t2     ,     t3
-------------------------------------------------------------------
123                2021-06-19         8:00      10:00       13:00

最高可达 t8。

我怎样才能做到这一点？我认为像枢轴一样的东西。

谢谢

标签： sqlsql-servertsql

解决方案

您可以使用row_number()条件聚合：

select time_resource_id, time_date,
       max(case when seqnum = 1 then time_hour end) as t1,
       max(case when seqnum = 2 then time_hour end) as t2,
       max(case when seqnum = 3 then time_hour end) as t3,
       max(case when seqnum = 4 then time_hour end) as t4,
       max(case when seqnum = 5 then time_hour end) as t5,
       max(case when seqnum = 6 then time_hour end) as t6,
       max(case when seqnum = 7 then time_hour end) as t7,
       max(case when seqnum = 8 then time_hour end) as t8
from (select t.*,
             row_number() over (partition by time_resource_id, time_date order by time_id) as seqnum
      from t
     ) t
group by time_resource_id, time_date

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