update train_employeedatabase_csv set yeargroup = case when age < 18 then 'Under 18' when age between 18 and 24 then 'On 18-24' when age between 25 and 34 then 'On 25-34' when age > 34 then 'Over34' end
update train_employeedatabase_csv set yeargroup = case when age < 18 then 'Under 18' when age between 18 and 24 then 'On 18-24' when age between 25 and 34 then 'On 25-34' when age > 34 then 'Over34' end