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Function for displaying data from seperate tables in same database.

Thread began 1/04/2010 7:22 am by ijk76319396 | Last modified 1/11/2010 6:44 pm by Jason Byrnes | 1249 views | 6 replies |


Function for displaying data from seperate tables in same database.

I am trying to display two separate data fields from two separate tables but have them connected two each other in a repeat region. So basically I want the name of a user from table one, next to it I want the date of his last upload from table two.

So it would look like (USER 1 last uploaded on DATE)

right now I have something that looks like this for mySQL

SELECT  uploads.`date`, subscribe.`date`, subscribe.subscribe2  
FROM subscribe, uploads
WHERE subscriber = %s AND uploads.`date`= subscribe.`date` ORDER BY uploads.`date` DESC"

Am I on the right track or way off here? Why wont it work?

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Jason ByrnesWebAssist

Your close, but you have to join the two tables together to get the correct data.

your subscribe table should have a primary key column, the uploads tabel should have a foreign key column that is used to relate the upload top the subscriber. This foreign key column can be used to join the two tables together using an INNER JOIN:
SELECT uploads.*`, subscribe.*
FROM uploads
INNER JOIN subscribe on uploads.<primaryKey> = subscribe.<forignKey>

you will need to substitute the names of your primary and foreign key column in the example above.

See the following for more info on join queries:

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How do I assign the foreign key to the field 'dates' in the table 'subscriber', the code I have now looks like...

SELECT uploads.*, subscribe.* 
FROM uploads
INNER JOIN subscribe on uploads.message_id =
WHERE subscriber =%s AND uploads.`date`= subscribe.`date`
ORDER BY uploads.`date` DESC

and is still not getting any results.

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PLEASE DISREGARD MY LAST POST: I am trying to do it through a new method but I still can't get my results. Alright instead of trying to pull the date from a different field I have added an insert record behavior to when the user uploads his page so it enters the date into the subscribe table, it works fine, and is entered into the database, BUT, I am still having trouble getting that date to be the one that shows up next to the last uploaded page.

My database is structured as follows:
ID=Key Column
subscribe2=(the username of the one being subscribed to)
subscriber= (the username of the one subscribing)
date=(a timestamp)
SUBID=( a unique numerical ID associated with each user)

Now when someone (user1)subscribes to a user (user2) the following would be entered into the database
SUBID=6(user2's unique numerical no.)

Now when user2 uploads a new page the following is entered into the same database
SUBID=6(user2's unique numerical no.)

so if the two above were consecutive rows it would look like this

1 - user2 - user1 - 1/3/2010 - 6
2 - NA - NA - 1/4/2010 - 6

My RSquery looks like this

("SELECT * FROM subscribe WHERE subscriber = %s ORDER BY `date` DESC"

This gives me the results as far as the users name being subscribed to, but with the date in row 1.
How can I get the users name being subscribed to BUT with the date from row two. Being that the SUBID field would be identical I thought I could group them together somehow but I'm not sure as to the method. Thanks!

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Jason ByrnesWebAssist

Instead of storing NA for the usernames the second time around, store the actual user name so the second record will look like:
2 - user2 - user1 - 1/4/2010 - 6

then change the order by clause to:

so the second record will be the first one returned.

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That solution only partly solves the problem, I can user session variables to enter the username and unique ID, but since 'user2' is updating their page it is not possible to enter user1's name, and since user1 is the one subscribing then there is no data to filter the results using their current session variable. The record looks like

2 - user2 - NA - 1/4/2010 - 6

Is their anyway to filter it by the userID number showing the last date but only return results filtered by the current session variable of the user logged on (the subscriber) so for example... if I had user1 subscribing to user2 and these two rows exist in the table.

1. user2 - user1 - 1/3/2010 - 6
2. user2 - NA - 1/4/2010 - 6

when user1 is logged on with a session variable equaling their username I need to filter by username= user1

the results I am looking for would be , user2 1/4/2010

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Jason ByrnesWebAssist

the problem is the way you are creating the database, it is not going to do what you want this way.

you should have a users table
userID - Primary Key

an Articles table

articleID - Primary Key
articleUserID - Foreign key relation to the users.UserID- this is the ID of the author

and a subscriptions table:
subscriptionID - Primary Key
subscriptionArticleID - Foreign key to articles.articleID
subscriptionUserID - Foreign key to users.userID - Id of the subscribers

you can then create a recordset like
SELECT users.*, articles.*, subscriptions.*
FROM users
INNER JOIN articles (INNER JOIN subscriptions ON articles.articleID = subscriptions.subscriptionArticleID )
ON users.UserID = articles.articleUserID
WHERE subscriptions.subscriptionUserID = <User1 ID>
ORDER BY articles.articleUpdateDate ASC

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