SQL Server Select 1 row per hour

6mzjoqzu 于 12个月前发布在其他

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I am using SQL Server 2019. I have a table in my database which contains a column called update_date. For example, if I have the following data, I would like to import one data per hour within the last 24 hours.

2023-11-28 14:50:55
2023-11-28 15:10:33
2023-11-28 15:11:33
2023-11-28 15:53:33
2023-11-28 16:13:35
2023-11-28 16:56:49
2023-11-28 16:56:50
2023-11-29 00:37:02
2023-11-29 00:40:02
2023-11-29 00:41:02
2023-11-29 00:42:02
2023-11-29 00:44:02

I would like to return

2023-11-28 14:50:55
2023-11-28 15:10:33
2023-11-28 16:13:35
2023-11-29 00:37:02

SELECT *
FROM table
WHERE update_date >= DATEADD(HOUR , -24, GETDATE())

I don't know how to add a query. Please help me

sql-server

来源：https://stackoverflow.com/questions/77576702/select-1-row-per-hour

1条答案

按热度按时间

gcmastyq1#

You can do it using GROUP BY and MIN() :

SELECT MIN(update_date) as mints
FROM mytable
WHERE update_date >= DATEADD(HOUR , -24, GETDATE())
GROUP BY CAST(update_date as DATE), DATEPART(HOUR, update_date);

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SQL Server Select 1 row per hour

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