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POSQL Query - replace hardcoded values... (MySQL)
 

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  1. POSQL Query - replace hardcoded values... (MySQL)
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    <p>We use a monitoring solution (zabbix). It stores trends data (MySQL 5.X) using a table called trends_uint with the following structure (simplified):</p> <pre><code>itemid clock value_avg 1 1238774400 100 1 1250773900 70 1 1250773200 50 </code></pre> <p>The clock field stores datetime values using Unix time.</p> <p>I'm trying to extract a report to see the consumption of a monitored item. I thought doing this by selecting the oldest record and the newest record. I achieved it doing the following:</p> <pre><code>SELECT (SELECT t.clock FROM trends_uint t WHERE t.itemid = 1 AND t.clock IN (SELECT MIN(t.clock) FROM trends_uint t WHERE t.itemid = 1)) AS minClock, (SELECT t.value_avg FROM trends_uint t WHERE t.itemid = 1 AND t.clock IN (SELECT MIN(t.clock) FROM trends_uint t WHERE t.itemid = 1)) AS minValueAvg, (SELECT t.clock FROM trends_uint t WHERE t.itemid = 1 AND t.clock IN (SELECT MAX(t.clock) FROM trends_uint t WHERE t.itemid = 1)) AS maxClock, (SELECT t.value_avg FROM trends_uint t WHERE t.itemid = 1 AND t.clock IN (SELECT MAX(t.clock) FROM trends_uint t WHERE t.itemid = 1)) AS maxValueAvg, (SELECT maxClock - minClock) AS timeGap, (SELECT minValueAvg - maxValueAvg) AS valueGap, (SELECT timeGap/86400) AS daysGap, (SELECT valueGap/daysGap/1024/1024) AS consumeMB </code></pre> <p>My problem is that I have lot's servers from which I want to calculate the consumption. I don't want to change the query for which one (changing the itemid).</p> <p>The system has another table (items) from which I could extract the items that I need to put into the report. Something like <code>SELECT itemid FROM items WHERE ...</code></p> <p>So this is my question: instead of using a hardcoded itemid, is it possible to make it "dynamic", for instance using the returned codes from another query (ex.: <code>SELECT ... FROM ... WHERE itemid IN (SELECT itemid FROM items WHERE ...</code>)?</p> <p>TIA,</p> <p>Bob</p>
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