Question

A table contains four columns “server”, “directory”, “usage” and “datetime”. All servers has got 10 dirs in common. I need to get the data for a server and it’s any dir the usage for the latest datetime in a day.
Say for example if there is a server A with directory B there will be Usage at multiple time for few days. I need the data to be reported by the query for all servers it’s all corresponding directory’s usage for the latest entry on each day.

Answer 1

If I understood your question correctly, you want to see the last usage for every server and directory. Given a table named “usagestats” with the given columns that would be:

SELECT a.server, a.directory, a.`usage`, a.datetime
    FROM usagestats as a INNER JOIN (
        SELECT server, directory, max(datetime) datetime
            FROM usagestats
            GROUP BY server, directory
        ) AS b ON (
            a.server = b.server
            and a.directory = b.directory
            and a.datetime = b.datetime
        )
    ORDER BY a.server, a.directory, a.datetime