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SQL group by and order by statment

Posted on 2014-02-11
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Last Modified: 2014-02-16
Hi,

I am creating a message board for a website i have created i am using mysql and php.

i have the following database(excel file)

Here is my thought process
1. id - auto increment to order by newest created
2. original_id - copies the id value of the first message created and continues to be redundant until the message is deleted.
3. status -
      a. active - normal message
      b. deleted - message has been moved to trash
      c. inactive - message has been completely deleted
4. viewed
      a. read - message has not been read
      b. unread - message has been read
5. saved - either empty or 'saved'
6. individuals
      a. multiple - the message is address to a group (3 or more people)
      b. private - 2 people
7. sender / recipient - the sender message is copied for each person in the message including themselves to make separate copies so each user can apply their own settings to the mysql row.
8. composted_ date - date created
9. subject /message - contents of message

the sql statements is as follows
$database='messages' ->name of my database
$sp_query3 ="SELECT * FROM ".$database." WHERE status='active' AND ";
$sp_query3.="saved!='saved' AND recipient='".$user."' GROUP BY original_id ORDER BY id DESC";
$sp_res3 = mysqli_query($link, $sp_query3) or die( mysqli_error($link));
while($sp_result3= mysqli_fetch_assoc($sp_res3)){


}

when i run this query it groups the messages fine however it does not order by id whats wrong?

thanks in advance
messages.xls.xlsx
0
Comment
Question by:J N
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8 Comments
 
LVL 22

Expert Comment

by:plusone3055
ID: 39850913
can you show in a screenshot how the query is being returned ?
0
 
LVL 6

Author Comment

by:J N
ID: 39850951
Array
(
    [id] => 7
    [original_id] => 7
    [status] => active
    [viewed] => read
    [saved] => 
    [individuals] => private
    [sender] => jaymenagy
    [recipient] => jaymenagy
    [composed_date] => 2014-02-10 21:32:06
    [subject] => 
    [message] => 
whats the plans for this weekend/friday

)
Array
(
    [id] => 6
    [original_id] => 5
    [status] => active
    [viewed] => read
    [saved] => 
    [individuals] => private
    [sender] => jaymenagy
    [recipient] => jaymenagy
    [composed_date] => 2014-02-10 21:31:20
    [subject] => Message board
    [message] => 
Hey!

 

So after i spoke with you i thought i would give this a try and it was a tricky one for sure. what do you think?

 

 

)
Array
(
    [id] => 3
    [original_id] => 3
    [status] => active
    [viewed] => read
    [saved] => 
    [individuals] => private
    [sender] => jaymenagy
    [recipient] => jaymenagy
    [composed_date] => 2014-02-10 21:29:02
    [subject] => 
    [message] => 
what are you doing this weekend?

)
Array
(
    [id] => 1
    [original_id] => 1
    [status] => active
    [viewed] => read
    [saved] => 
    [individuals] => private
    [sender] => jaymenagy
    [recipient] => jaymenagy
    [composed_date] => 2014-02-10 21:27:41
    [subject] => 
    [message] => 
Whats up bud!

)

Open in new window

0
 
LVL 13

Assisted Solution

by:magarity
magarity earned 600 total points
ID: 39850970
You have to group by averything that isn't an aggregate function.  So you've said 'select *' but then only group by original id.  That's won't work; you'd have to list all the columns in * in the group by.  What exactly are you hoping to do with the group by clause?
0
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LVL 6

Author Comment

by:J N
ID: 39850976
So the group by original_id is fine but it is pulling in the wrong id

for example in my excel sheet

for original_id =  the highest value of id=21 and i want the 21 record
0
 
LVL 6

Author Comment

by:J N
ID: 39850980
please see above i explained it
0
 
LVL 6

Accepted Solution

by:
J N earned 0 total points
ID: 39851089
i added this and it seemed to work out
$columns= "MAX(id) AS id, original_id, status, viewed, saved, individuals, sender, recipient, composed_date, subject, message";

$query ="SELECT ".$message_columns." .....

and it seems to work
0
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 39851272
If you're really creating a PHP / SQL application for a message board, that's a little like trying to build a 2001 Chevrolet.  The science has all been done and you might find something that is free and open-source by making a Google search.  Consider phpBB or any of the systems listed her:
http://en.wikipedia.org/wiki/Comparison_of_Internet_forum_software
0
 
LVL 6

Author Closing Comment

by:J N
ID: 39862475
i figured out the solution based partly on the experts answer
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