sql server - Select only maximum value record for multiple rows -


i have 1 table, having records like, 

unit    rate    dateeffected ------------------------------------------- alha    ils     2014-03-02 00:00:00.000 alha    ils     2014-08-02 00:00:00.000 buck    ils     2013-02-14 00:00:00.000 buck    ils     2014-03-02 00:00:00.000 buck    ils     2014-08-02 00:00:00.000 casc    ild     2013-02-14 00:00:00.000 casc    ild     2014-03-02 00:00:00.000 casc    ild     2014-08-02 00:00:00.000

now, want maximum date value record selection in result table. is,

unit    rate    dateeffected ------------------------------------------- alha    ils     2014-08-02 00:00:00.000 buck    ils     2014-08-02 00:00:00.000 casc    ild     2014-08-02 00:00:00.000

hope helps.

select  unit,  rate, max(dateeffected) maxdateeffected tablename group  unit,rate

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