sql - Help to the way to write a query for the requirement -

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i need write sql-server query don't know how solve. have table realtimedata data:

 time                   |    value 4/29/2009 12:00:00   |   3672.0000 4/29/2009 12:01:00   |   3645.0000 4/29/2009 12:02:00   |   3677.0000 4/29/2009 12:03:00   |   3634.0000 4/29/2009 12:04:00   |   3676.0000      // eod of day "4/29/2009" 4/30/2009 12:00:00   |   3671.0000 4/30/2009 12:01:00   |   3643.0000 4/30/2009 12:02:00   |   3672.0000 4/30/2009 12:03:00   |   3634.0000 4/30/2009 12:04:00   |   3632.0000 4/30/2009 12:05:00   |   3672.0000      // eod of day "4/30/2009" 5/1/2009 12:00:00    |   3673.0000 5/1/2009 12:01:00    |   3642.0000 5/1/2009 12:02:00    |   3672.0000 5/1/2009 12:03:00    |   3634.0000 5/1/2009 12:04:00    |   3635.0000      // eod of day "5/1/2009"

i want eod's data of days exist in table. (eod = end of day). sample's data, need reture table following:

   time      |    value 4/29/2009    |  3676.0000 4/30/2009    |  3672.0000 5/1/2009     |  3635.0000

note: write comment can know eod. , sql server version 2005.

note: data in realtimedata table large more 400.000 rows. please me write in optimization.

please me solve problem. thanks.

with rankedrealtimedata (   select *, row_number() on (       partition convert(varchar(10), [time], 121)        order time desc) rn   realtimedata ) select * rankedrealtimedata rn=1;

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