Update duplicate rows only with a MAX function in SQL

Question

I have a table like this, where, suppose for the sake of an example, NAME is a unique identifier.

NAME    AGE         VALUE
Jack    Under 65    3
Ja         


        

Answer 1

You can define custom order with case when clause and then use analytic max(). This worked for given examples:

update t1 set age = (
    select max(age) keep (dense_rank last 
           order by case when age = 'Over 75'  then 1
                         when age = '66-74'    then 2
                         when age = 'Under 65' then 3
                         when age = '25-35'    then 4
                    end)
    from t1 tx where tx.name = t1.name )