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POSQL query for combining rows that have overlapping dates in separate columns
 

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  1. POSQL query for combining rows that have overlapping dates in separate columns
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    <p>this is an odd question. let me lay out my table structures...</p> <p>my 'server' table gives me status information of my servers (i get a few of these messages every minute). my 'client' table is updated with client info (clients connected to servers, obviously).</p> <p>one server in the cluster is always the 'primary', so to speak (others are secondary). each client delivers me latency info to each of my servers. </p> <p>i need to see the rows where the client latency is greater than 60 seconds, but i also need to know the status of each server as well.</p> <p>here are example tables (server, then client):</p> <pre><code> server_name | server_role | sstat_time --------------+-----------------+---------------------- server1 | PRIMARY | 2013-05-15 01:01:00 server2 | SECONDARY | 2013-05-15 01:02:00 server3 | SECONDARY | 2013-05-15 01:02:00 server1 | PRIMARY | 2013-05-15 01:05:00 server2 | SECONDARY | 2013-05-15 01:06:00 server3 | PRIMARY | 2013-05-15 01:10:00 server1 | SECONDARY | 2013-05-15 01:11:00 server1 | PRIMARY | 2013-05-15 01:22:00 server3 | SECONDARY | 2013-05-15 01:23:00 </code></pre> <p>client:</p> <pre><code> client_name | server_dest | latency | cstat_time ------------+---------------+-----------+-------------------- client1 | server1 | 2 | 2013-05-15 01:01:30 client2 | server2 | 68 | 2013-05-15 01:01:40 client2 | server1 | 99 | 2013-05-15 01:01:50 client1 | server3 | 5 | 2013-05-15 01:10:00 client2 | server3 | 78 | 2013-05-15 01:10:30 client2 | server1 | 15 | 2013-05-15 01:10:50 </code></pre> <p>so, my desired result of this query would be:</p> <pre><code>client_name | server_name | latency | server_role | cstat_time --------------+---------------+-----------+--------------+-------------------- client2 | server2 | 68 | SECONDARY | 2013-05-15 01:01:04 client2 | server1 | 99 | PRIMARY | 2013-05-15 01:01:50 client2 | server3 | 78 | PRIMARY | 2013-05-15 01:10:30 </code></pre> <p>i need to know when that latency is over 60 seconds, but also the role of the latent server at that point in time. </p> <p>any clue how to do this?</p> <p>i'm running on Postgres 8.4.</p>
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