MariaDB/Mysql SELECT 从 - 到子查询

Question

我有一个 table 'Device' 安装日期和客户：

Id	DeviceName	Installed	Customer
1	A	2021-10-10	1
2	B	2021-10-10	1
3	A	2021-10-20	2
4	A	2021-10-30	3

我需要以下结果

DeviceName	InstalledFrom	InstalledTo	Customer
A	2021-10-10	2021-10-20	1
B	2021-10-10	NULL	1
A	2021-10-20	2021-10-30	2
A	2021-10-30	NULL	3

尝试了以下SQL

select a.DeviceName, a.Installed as InstalledFrom, b.installed as InstalledTo, a.customer 
from Device a 
left outer join Device b on ( b.DeviceName = ( SELECT DeviceName 
                                               FROM Device 
                                               where DeviceName = a.DeviceName 
                                                 AND Installed > a.Installed 
                                               order by installed limit 1) )

但这并没有给出预期的结果。

感谢您的帮助！

Answer 1

测试一下：

SELECT t1.DeviceName,
       t1.Installed InstalledFrom,
       t2.Installed InstalledTo,
       t1.Customer
FROM Device t1
LEFT JOIN Device t2 ON t1.DeviceName = t2.DeviceName
                   AND t1.Installed < t2.Installed
WHERE NOT EXISTS ( SELECT NULL
                   FROM Device t3
                   WHERE t1.DeviceName = t3.DeviceName
                   AND t1.Installed < t3.Installed
                   AND t3.Installed < t2.Installed )

MariaDB/Mysql SELECT 从 - 到子查询

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