Question

Help with SQL query

Asked by: kiranvj

Hi,

I need  some help with a SQL query.

I have two tables apps and user_apps

apps table stores list of applications
user_apps store what all apllications an user has

These are the fields of apps table
app_id
app_name

These are the fields of user_apps table
id - autonumber
uid
app_id (contains app_id from apps table)

Issue
I cannot get the correct SQL query to get the list of applications an user(say uid = 1) DOES NOT have.
I tried joins but cannot get it done.

Hope its clear. Any help will be really helpful. Thanks in advance
Kiranvj

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Asked On
2008-07-19 at 12:29:48ID23579378
Tags

mysql query sql

Topic

MySQL Server

Participating Experts
2
Points
350
Comments
5

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Answers

 

by: pzozulkaPosted on 2008-07-19 at 12:35:03ID: 22043467

Try this:

Select user_apps.id, user_apps.uid, user_apps.app_id, apps.app_name
From user_apps UA LEFT OUTER JOIN apps A ON A.app_id = UA.app_id
WHERE UA.app_id NOT IN (Select app_id from apps)

 

by: kiranvjPosted on 2008-07-19 at 12:42:56ID: 22043486

thanks for the reply, but where should i give the uid = 1

 

by: kiranvjPosted on 2008-07-19 at 12:48:55ID: 22043501

hi,

I found it

Select * from apps where app_id NOT IN (select app_id from user_apps where uid =1)

thanks for you help

Kiranvj

 

by: RQuadlingPosted on 2008-07-19 at 12:52:35ID: 22043511

I assume you have a users table also?

You could try this ...

SELECT
      u.user_id
      u.user_name,
      a.app_id,
      a.app_name
FROM
      users u
      inner join
      user_apps ua on u.user_id = ua.uid
      full outer join apps a on ua.app_id = a.app_id
WHERE
      ua.app_id is null


The idea is for each user, attach all the known apps to the user and filter out those that are not null, leaving only the null user_apps rows.

Say there are 3 users and 3 apps and each user has the app of their id.

User 1 has app 1, user 2 has app 2 and user 3 has app 3.

The data would be ...

Users id/name
1 Richard
2 Sally
3 Jane

Apps
1 Word
2 Excel
3 Outlook

User_apps id/uid/app_id
1 1 1
2 2 2
3 3 3

So, the without the filter the output would be ...

user_id, user_name, app_id, app_name
1 Richard 1 Word
1 Richard 2 Excel
1 Richard 3 Outlook
2 Sally 1 Word
2 Sally 2 Excel
2 Sally 3 Outlook
3 Jane 1 Word
3 Jane 2 Excel
3 Jane 3 Outlook

With the filter we won't show where there IS a user <-> app relationship, so ...

user_id, user_name, app_id, app_name
1 Richard 2 Excel
1 Richard 3 Outlook
2 Sally 1 Word
2 Sally 3 Outlook
3 Jane 1 Word
3 Jane 2 Excel


I hope that's the result you want.

If you wanted to filter this further for a single user, then use ...

WHERE
      ua.app_id is null and u.user_id = 1

sort of thing.

UNTESTED.

Regards,

Richard Quadling.

 

by: kiranvjPosted on 2008-08-10 at 21:35:15ID: 22201837

Sorry for the delay. Thank you all for your time and efforts.

Kiranvj :)

20120131-EE-VQP-002

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