How to I return a case record with latest date using SQL

Question

I want a query that returns a record set of the shaded rows from the table above for each unique case_id by the latest data_level_assinged value. I tried something like this:

SELECT case_id, level, date_level_assigned
FROM table
SORT BY case_id, date_level_assigned DESC;

From reading it looks like I need to use an aggregate function like MAX(data_level_assinged) but am not sure how to do this.

Answer 1

You're almost there. Using MAX is a good approach.

SELECT b.case_id, a.level, b.date_level_assigned FROM tablename a
JOIN
    ( SELECT MAX(date_level_assigned) as date_level_assigned, case_id
    FROM tablename
    GROUP BY case_id
    ) as b
ON a.case_id = b.case_id AND a.date_level_assigned = b.date_level_assigned

You can do it in this way