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9.3

Joining tables based on scaled value of fields

Asked by peterbrowne in PHP Scripting Language, PHP and Databases, MySQL Server

I have several tables with the following fields:

node_m_data_id, timestamp, user_count

Each table is fed data from a specific node; a ten digit unix timestamp and the number of users logged into that node at that time.

I have been using the following code to display this data from each of the tables as graph overlays.

Problem is that the graph overlays are now out of sync.  Rather than joining the tables on the ids, eg node_o_data_id = node_q_data_id, the joining should occur by matching the unix timestamps.  However, the problem is the timestamps (eg 1256605740, 1256605620) will vary by hundreds of seconds for each record.  What needs to happen is to join the tables based on matched values on the timestamps, say on the thousands of seconds).  Any idea of how to do this? 
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$ts_last_month = strtotime('-30 days');
 
$query = "SELECT 
node_q_data.timestamp AS timefield, 
node_k_data.user_count AS users_k, 
node_l_data.user_count AS users_l, 
node_m_data.user_count AS users_m, 
node_n_data.user_count AS users_n, 
node_r_data.user_count AS users_r, 
node_o_data.user_count AS users_o, 
node_p_data.user_count AS users_p, 
node_q_data.user_count AS users_q 
FROM 
node_k_data, 
node_l_data, 
node_m_data, 
node_n_data, 
node_r_data, 
node_o_data, 
node_p_data, 
node_q_data
WHERE 
node_k_data_id = node_q_data_id 
AND 
node_l_data_id = node_q_data_id
AND 
node_m_data_id = node_q_data_id
AND 
node_n_data_id = node_q_data_id
AND 
node_r_data_id = node_q_data_id
AND 
node_o_data_id = node_q_data_id
AND 
node_p_data_id = node_q_data_id AND node_q_data.timestamp > '$ts_last_month'";
$result = mysql_query($query, $connection) or die(mysql_error());
 
while($row = mysql_fetch_assoc($result)){  
  $timestamp =  date('d-m-y H:i',$row['timefield']);
  $users_k = $row['users_k'];
  $users_l = $row['users_l'];
  $users_m = $row['users_m'];
  $users_n = $row['users_n'];
  $users_r = $row['users_r'];
  $users_o = $row['users_o']; 
  $users_p = $row['users_p'];
  $users_q = $row['users_q'];
  echo "$timestamp;$users_k;$users_l;$users_m;$users_n;$users_r;$users_o;$users_p;$users_q\n";
}
[+][-]10/27/09 12:55 AM, ID: 25669949Accepted Solution

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About this solution

Zones: PHP Scripting Language, PHP and Databases, MySQL Server
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Solution Provided By: julianH
Participating Experts: 1
Solution Grade: A
 
 
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