Merge 2 tables for a SELECT query?

Question

First.. here are the two tables I\'ve created (sans irrelevant columns)..

CREATE TABLE users_history1 (
  circuit tinyint(1) unsigned NOT NULL default \'0\',         


        

Answer 1

You'll want to use a UNION SELECT:

SELECT p.id, COUNT(p.id), SUM(p.points)
FROM (SELECT userh_userid AS id, userh_points AS points
      FROM users_history1
      UNION SELECT userl_userid, userl_points
      FROM users_ladders1) AS p
GROUP BY p.id

The sub query is the important part. It will give you a single table with the results of both the current and history tables combined. You can then select from that table and do COUNT and SUM to get your averages.

My MySQL syntax is quite rusty, so please excuse it. I haven't had a chance to run this, so I'm not even sure if it executes, but it should be enough to get you started.