topic Re: Association problem due to same attribute names in QlikView

Association problem due to same attribute names

Thu, 05 Jul 2012 12:01:50 GMT

Hello everyone,

I'm currently struggling with the following situation: I have a table with three columns:

Thread_id (ID of the thread, referring to a thread in a forum)

Creator_id (ID of the thread creator, this references another table with more information about the user)

Participant_Id (ID of the thread participant, this references the previous table with user information as well).

Now the referenced attribute in the user table is called u_id. When I load both creator_id as well as participant_id as u_id, I receive an error. Is it possible to add references to the user table manually? Or does another solution exist?

Regards,

Stephan

Re: Association problem due to same attribute names

Or — Thu, 05 Jul 2012 12:13:40 GMT

There's two options here - the easy compromise, and the harder full solution.

Easy: Load the user table twice. Rename u_id in the first instance as Creator_id, and once as Participant_Id. This will give you the details for both, but it will not allow you to select a single user from a single listbox and and see all of their details both as creator as participant. However, if the original post in the thread contains Creator_id = Participant_id, this would probably be an adequate solution.

Hard: Link to a single instance of the description table. This has been covered on this forum, e.g. here and here - I would only go with this option if it is necessary to select the user from a single location and view their data both as participant and creator.

Good luck.

Re: Association problem due to same attribute names

Thu, 05 Jul 2012 12:17:58 GMT

Ok, thanks for your help! I will try to realize the full solution

Re: Association problem due to same attribute names

Thu, 05 Jul 2012 12:58:21 GMT

Unfortunately, I can't really make it work. I currently try the following:

user_map:

Mapping SELECT * FROM users;

SELECT

thread_id,

ns_creator_id,

ns_participant_id,

Applymap('user_map',ns_creator_id),

Applymap('user_map',ns_participant_id)

FROM module_network_structure;

Do you see a mistake? I attached the two tables from the viewer as a screenshot.

Re: Association problem due to same attribute names

Or — Sun, 08 Jul 2012 10:41:32 GMT

Mapping tables should include two columns - the ID value first, and the name value second. It looks like yours contains significantly more columns than that.

One other small note - you should probably add an alias ( as Creator / as Participant) to your Applymap()s, just to make things easier to look at later.