SELECT id,col1,col2,col3, riskLvel
FROM table1
where risklevel IN ( SELECT MAX(riskLevel)
FROM table1
GROUP BY col1 )
IF This query is not correct then you can try this query
SELECT id,col1,col2,col3, riskLvel FROM table1 where col1 IN ( SELECT MAX(col1) FROM table1 GROUP BY col1 )
SELECT id,col1,col2,col3, riskLvel
FROM table1
where col1 IN ( SELECT MAX(col1)
FROM table1
GROUP BY col1 )