The sum of a group of two tables by date in MySQL

Question

I have two different tables, click and click. I would like to query MySQL to get the amount of fees generated by clicks and outputs sorted by date.

Leading:

id|date      |commission
 1|2009-06-01|400
 2|2009-06-01|300
 3|2009-06-03|350

Click

id|date      |commission
 1|2009-06-01|1
 2|2009-06-03|2
 3|2009-06-03|1

I would like to create a query that gives me (and, if possible, also a date when no lead or click was generated):

date      |commission click|commission lead|total commission
2009-06-01|               1|            700|             701
2009-06-02|               0|              0|               0
2009-06-02|               3|            350|             353

(the date is actually datetime in a real database.)

I think I need to combine:

SELECT count(*) as number_clicks, sum(click.commission) as sum_clicks,
 date(click.time) as click_date from click group by click_date order by click_date

FROM

SELECT count(*)as number_leads, sum(lead.commission) as sum_leads,
 date(lead.time) as lead_date from lead group by lead_date order by lead_date

But I can’t get them to work together.

Answer 1

, . - ():

SELECT commission_date, SUM(click_commission), SUM(lead_commission), SUM(total_commission)
FROM (SELECT DATE(click.time) AS commission_date, click.commission AS click_commission,
             0 AS lead_commission, click.commission AS total_commission
      FROM click
      UNION ALL
      SELECT DATE(lead.time) AS commission_date, 0 AS click_commission,
             lead.commission AS lead_commission, lead.commission AS total_commission
      FROM lead) AS foo
GROUP BY commission_date
ORDER BY commission_date