如何根據SQL中的時間進行狀態檢查/檢出？

Question

我有這個SQL問題，如下圖所示。有沒有辦法解決這個問題？

Answer 1

使用ROW_NUMBER概念：

SELECT id , time , CASE WHEN MIN(RNo) = 1 THEN 'CheckIn' WHEN MAX(RNo) > 1  
THEN 'CheckOut' END 
FROM 
(
    SELECT * , ROW_NUMBER() OVER (PARTITION BY id ORDER BY time) RNo 
    FROM @table 
) A 
GROUP BY id , time 

Answer 2

Declare @table table (rowno int identity (1,1),id varchar(10),[time] time) 
insert into @table 
select '01','10:08:23' 
union all 
select '02','10:10:50' 
union all 
select '01','13:30:00' 

;with cte as 
(
select *,row_number()over(partition by id order by id)n from @table 
)select id,time,case when n=1 then 'checkin' else 'checkout'end status from cte order by rowno