有没有办法从表中检索最新的第一个“状态”值？答案

【问题标题】：Is there a way to retrieve the latest of the first `status` value from the table?有没有办法从表中检索最新的第一个“状态”值？
【发布时间】：2022-01-16 02:51:48
【问题描述】：

我一直在尝试编写一个查询，该查询返回第一条状态匹配记录的latest 与查询本身。假设我有下面的表记录，我想检索APP_ID 和INSERTED_AT 列，其中STATUS 应该是Offer Sent 中的第一个，发生在最新的Selectable 状态之后，如果有任何Offer Declined 都应该忽略它。

ID	APP_ID	INSERTED_AT	UPDATED_AT	STATUS
1	209377	2021-05-13 20:57:30.000 +0530	2021-05-13 20:57:30.000 +0530	Selectable
2	209377	2021-05-13 20:57:58.000 +0530	2021-05-13 20:57:58.000 +0530	Selectable
3	209377	2021-05-14 18:40:08.000 +0530	2021-05-14 18:40:08.000 +0530	Offer Eligible
4	209377	2021-05-14 18:40:14.000 +0530	2021-05-14 18:40:14.000 +0530	Offer Sent
5	209377	2021-05-15 18:57:50.000 +0530	2021-05-15 18:57:50.000 +0530	Offer Sent
6	209377	2021-05-15 20:44:29.000 +0530	2021-05-15 20:44:29.000 +0530	Offer Sent
7	209377	2021-05-17 22:45:13.000 +0530	2021-05-17 22:45:13.000 +0530	Offer Accepted
8	110011	2021-05-13 20:57:30.000 +0530	2021-05-13 20:57:30.000 +0530	Selectable
9	110011	2021-05-13 20:57:58.000 +0530	2021-05-13 20:57:58.000 +0530	Offer Eligible
10	110011	2021-06-14 18:40:08.000 +0530	2021-05-14 18:40:08.000 +0530	Offer Sent
11	300110	2021-05-14 18:40:14.000 +0530	2021-05-14 18:40:14.000 +0530	Selectable
12	300110	2021-05-15 18:57:50.000 +0530	2021-05-15 18:57:50.000 +0530	Offer Eligible
13	300110	2021-05-15 20:44:29.000 +0530	2021-05-15 20:44:29.000 +0530	Offer Sent
14	300110	2021-05-17 22:45:13.000 +0530	2021-05-17 22:45:13.000 +0530	Offer Declined

这是我正在寻找的预期结果

APP_ID	INSERTED_AT	STATUS
209377	2021-05-14 18:40:14.000 +0530	Offer Sent
110011	2021-05-14 18:40:08.000 +0530	Offer Sent
300110	nil	Offer Declined

【问题讨论】：

标签： sql postgresql

【解决方案1】：

试试这个

    Select *, max(case when status ='Selected' then
     When lag(status) over (order by 
     null) ='Offer Sent' then 'Offer Sent' 
     Else nil end) 
   From
   (
   Select APP_ID, INSERTED_AT,  
   Status 
    From table
    Where status in ('Selected', 'Offer Sent', 'Offer 
     Declined'))

【讨论】：