Question

I have a table with the following data:

=========================================
| name        |  version   | project_id |
=========================================
| foo         |           1|           1|
| new foo     |           2|           1|
| bar         |           1|           2|
=========================================

How can I write a query that returns the highest version record for each product? from the table above, I’d want the following results:

=========================================
| name        |  version   | project_id |
=========================================
| new foo     |           2|           1|
| bar         |           1|           2|
=========================================           

Answer 1

SELECT
  t1.name, t1.version, t1.project_id
FROM
  tablename t1
JOIN
  (SELECT max(version) as version, project_id FROM tablename GROUP BY project_id) t2
ON t1.project_id = t2.project_id AND t1.version = t2.version