按日期时间的 SQL 查询组

Question

I've a database table where I store data 3 to 9 times in a minute. I store data with ID , XYZ value and CreateDateTime Value

Now, I want to write a script where the return value shows maximum value of XYZ in every Minute.

Please help me to write this script.

Answer 1

You can do this using row_number() :

select t.*
from (select t.*,
             row_number() over (partition by dateadd(minute, datediff(minute, 0, createdatetime), 0)
                                order by xyz desc
                               ) as seqnum
      from t
     ) t;

Note: This returns the row in each minute with the maximum value.