Solved

Count the number of games that are being played on average per user

Posted on 2014-07-28
9
329 Views
Last Modified: 2014-07-29
Hi Experts

I have the following PostgreSQL code which returns the number of created games per user.

SELECT "user", COUNT("user") AS games
FROM
(
   SELECT "games"."player_id" AS "user" FROM "games"
   UNION ALL 
   SELECT "games"."opponent_id" FROM "games"
) AS t
WHERE "user" IS NOT NULL
GROUP BY "user"
ORDER BY games DESC

Open in new window

Output:
USER      GAMES
56997     3642
44801     3155
3682       3134
58255     2673
64718     2384
...

However, I would like to know the number of games that are being played on average per user. I've tried various solutions without success. Can you help? Thanks!
0
Comment
Question by:Kenni Larsen
  • 3
  • 3
  • 2
  • +1
9 Comments
 
LVL 47

Expert Comment

by:Dale Fye (Access MVP)
ID: 40225535
I'm not sure I understand the question.  Do you want to know how many games the user has active on any particular day, or the average number of games they have played on a given day?  

do you have a user game start and end date field?
0
 

Author Comment

by:Kenni Larsen
ID: 40225544
Hi fyed

Thanks for asking.

I just want to know how many games each user plays on average. Regardless of date.
Like the sum of all games divided by the total number of users.

I hope it made ​​it more clear. Thanks!
0
 
LVL 47

Expert Comment

by:Dale Fye (Access MVP)
ID: 40225563
So, I think what you are saying, is (for the sample data):

56997     3642
44801     3155
3682       3134
58255     2673
64718     2384

What you want is the number: 2997.6

Which is (3642+3155+3134+2673+2384)/5

Is that correct?
0
 

Author Comment

by:Kenni Larsen
ID: 40225609
Yes, exactly!
0
DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

 
LVL 41

Accepted Solution

by:
pcelba earned 500 total points
ID: 40225670
So in SQL:
SELECT AVG(games) FROM 
  (SELECT "user", COUNT("user") AS games
   FROM
   (
      SELECT "games"."player_id" AS "user" FROM "games"
      UNION ALL 
      SELECT "games"."opponent_id" FROM "games"
   ) AS t
   WHERE "user" IS NOT NULL
   GROUP BY "user"
  ) AS g

Open in new window

0
 
LVL 32

Expert Comment

by:awking00
ID: 40226573
Just out of curiosity, assuming games has a playerid of 58255 with an opponentid of 56997 and  also has a playerid of 56997 with an opponentid of 58255, wouldn't that show as two games when, in fact, it's only one using union all?
0
 
LVL 41

Expert Comment

by:pcelba
ID: 40226605
That's OK. Each player plays the game thus two players playing together have average 1 game played not 0.5. Each of them can say "I have been playing one game".

The number of matches is the half if we assume two player games, of course.
0
 

Author Closing Comment

by:Kenni Larsen
ID: 40226695
It works exactly as expected. Thank you for all your assistance, it's greatly appreciated!
0
 
LVL 41

Expert Comment

by:pcelba
ID: 40226755
Thanks for the points. My opinion: you should split a part of them among others.
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Cassandra Select Query 1 56
Save conflict messages on existing documents 15 55
Write Caching in the Cloud for VFP9 16 89
Process mapping 5 29
Entering time in Microsoft Access can be difficult. An input mask often bothers users more than helping them and won't catch all typing errors. This article shows how to create a textbox for 24-hour time input with full validation politely catching …
This article explains all about SQL Server Piecemeal Restore with examples in step by step manner.
Steps to create a PostgreSQL RDS instance in the Amazon cloud. We will cover some of the default settings and show how to connect to the instance once it is up and running.
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

861 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

25 Experts available now in Live!

Get 1:1 Help Now