Question

I know my question is bit confusing but if I show you data it will make more sense what I am trying to achieve.

I am reading everything from one table T only.

I am reading 6 fields from that table T.

StartKey
Name
Min
LName
MName
ID

Top Table is data, and bottom table is what I am trying to achieve.
I need to get for each startkey get max(minutes)

FORGOT TO INCLUDE 20130221 in output.

Here is what I tried so far

select 
       startkey,
       name,
       min,
       lname,
       mname,
       id
from T
where startkey >= '20130118'
group by startkey,name,lname,mname,id
order by startkey

but it doesn’t work

Answer 1

For each start-key, you want to find the Max “min” value. this can be done via a nested sub-query. Then , select only where the min is equal to the max(min).
Also, if you have a situation where two records can have the same value of startkey and min, then you will need to resolve that, otherwise you will select them both.

select  startkey, name, min, lname, mname, id
from T T1
where min = 
 (select max(min) from T T2 where T1.startkey=T2.startkey)

order by startkey