sql - How to select MAX value in field based on another field -


i have query (oracle query returning results linked server sql table) returns results this: -

personid | encounterno | location ---------+-------------+----------- 123456   | 1           | london 123456   | 2           | manchester 123456   | 3           | glasgow 246810   | 1           | liverpool 246810   | 2           | newcastle 357911   | 1           | edinburgh 357911   | 2           | aberdeen 357911   | 3           | dublin

i select max value each personid output be: -

personid | encounterno | location ---------+-------------+------------- 123456   | 3           | glasgow 246810   | 2           | newcastle 357911   | 3           | dublin 

select t.* table t inner join (     select t.personid, max(t.encounterno)     table t     group t.personid ) j on t1.personid = j.personid , t.encounterno = j.encounterno

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