I have 3 columns... Name, Sequence, Date
|a    ,   1      , 2015-11-01
|a    ,   1      , 2015-10-15
|a    ,   1      , 2015-09-24
|a    ,   2      , 2015-08-24
|a    ,   2      , 2015-07-25
|b    ,   1      , 2015-11-11
|b    ,   1      , 2015-11-09
|b    ,   2      , 2015-04-09
|b    ,   3      , 2015-01-01
How to find earliest date for all sequency for all name ??
result ---- |a, 1, 2015-11-01
            |a, 2, 2015-08-24
            |b, 1, 2015-11-11
            |b, 2, 2015-04-09
            |b, 3, 2015-01-01
 
    