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POSQL query advice (replacing exists with joins)
 

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    <p>I have table with following fields and indexes: <img src="https://i.stack.imgur.com/PBBZr.png" alt="enter image description here"><br> I need to make a query that will do:</p> <blockquote> <p>check table, if there are <strong>Dial</strong> events, after which (with same unique_id) no <strong>Bridge</strong> or <strong>Hangup</strong> events comes </p> </blockquote> <p><em>or</em> </p> <blockquote> <p>if there are <strong>NewCallerId</strong> events, with no <strong>Hangup</strong> events after it (with same unique_id) or no <strong>Dial</strong> events (with call_id = current unique_id)</p> </blockquote> <p>There was one query, but I didn't make it work, and users answers didn't help either. Here's the query that does the work in 395 seconds (too long):</p> <pre><code>SELECT t1.* FROM ASTERISK t1 WHERE EXISTS (SELECT t2.* FROM ASTERISK t2 WHERE t1.OPERATOR_DIAL = '$extension' AND t1.EVENT = 'Dial' AND NOT EXISTS (SELECT t3.* FROM ASTERISK t3 WHERE t3.UNIQUE_ID = t1.UNIQUE_ID AND ( t3.EVENT = 'Hangup' OR t3.EVENT = 'Bridge' ))) OR EXISTS (SELECT t4.* FROM ASTERISK t4 WHERE t1.EVENT = 'NewCallerid' AND t1.OPERATOR_DIAL = '$extension' AND NOT EXISTS (SELECT t5.* FROM ASTERISK t5 WHERE ( t5.UNIQUE_ID = t1.UNIQUE_ID AND t5.EVENT = 'Hangup' ) OR ( t5.CALL_ID = t1.UNIQUE_ID AND t5.EVENT = 'Dial' ))) ORDER BY DATE DESC LIMIT 1 </code></pre> <p>Tried to rewrite it with JOINS, but getting <em>#1248 - Every derived table must have its own alias</em></p> <p>This is my attempt with a JOIN query:</p> <pre><code>SELECT t1.* FROM asterisk t1 INNER JOIN (SELECT t2.* FROM asterisk t2 WHERE t1.operator_dial = '$extension' AND t1.event = 'Dial' LEFT OUTER JOIN (SELECT t3.* FROM asterisk t3 WHERE t3.unique_id = t1.unique_id AND (t3.event = 'Hangup' OR t3.event = 'Bridge'))) OUTER JOIN (SELECT t4.* FROM asterisk t4 WHERE t1.event = 'NewCallerid' AND t1.operator_dial = '$extension' LEFT OUTER JOIN (SELECT t5.* FROM asterisk t5 WHERE (t5.unique_id = t1.unique_id AND t5.event = 'Hangup') OR (t5.call_id = t1.unique_id AND t5.event = 'Dial'))) ORDER BY DATE DESC LIMIT 1 </code></pre> <p>To show, how the query should work I made 2 screenshots (top part has some calls that will not be in query result and bottom part is one call that must be in query result: <img src="https://i.imgur.com/8P9LLmF.png" alt="screen"></p>
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    1. COCan you post the JOIN query you tried?
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    2. COhttp://pastebin.com/sut22jx5
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