MySQL query, MAX() + GROUP BY

Question

Daft SQL question. I have a table like so (\'pid\' is auto-increment primary col)

CREATE TABLE theTable (
    `pid` INT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
          


        

Answer 1

If you want to avoid a JOIN, you can use:

SELECT pid, rid FROM theTable t1 WHERE t1.pid IN ( SELECT MAX(t2.pid) FROM theTable t2 GROUP BY t2.rid);