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POJoining three tables - issue with alias and Query not properly ended
 

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  1. POJoining three tables - issue with alias and Query not properly ended
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    <p>I think the error description is a bit misleading, as I don't see anything wrong with the way the query is ended. I am trying to join three tables, and this is not working. Can someone point to what I'm doing wrong? This is on Oracle, by the way.</p> <pre><code>SELECT s.PITIMEDATE, ROUND(SYSDATE-s.PITIMEDATE) DIFFDAYS, s.SRC, s.VSA6, a.VSA9, c.COMMENTS, c.Actions, c.MYID FROM alarm_standing_MAU AS s INNER JOIN alarm_MAU AS a ON a.SRC = s.SRC AND a.VSA9 = (SELECT VSA9 FROM a WHERE a.SRC = s.SRC AND ROWNUM=1) INNER JOIN Alarm_Standing_Comments AS c ON c.SRC = s.SRC AND s.SRC&lt;&gt;'LastCheck' GROUP BY s.SRC, s.PITIMEDATE, s.VSA6, a.VSA9, c.Comments, c.Actions, c.MYID ORDER BY s.PITIMEDATE ASC </code></pre> <hr> <p>For more info, I was trying to add a second join to a query, but it was getting a bit unwieldy, so was experimenting with an alias. Here is the initial query - I would be interested in knowing how to improve readability via an alias.</p> <pre><code>SELECT alarm_standing_MAU.PITIMEDATE, ROUND(SYSDATE-alarm_standing_MAU.PITIMEDATE) DIFFDAYS, alarm_standing_MAU.SRC, alarm_standing_MAU.VSA6, alarm_MAU.VSA9 FROM alarm_standing_MAU INNER JOIN alarm_MAU ON alarm_MAU.SRC = alarm_standing_MAU.SRC AND alarm_MAU.VSA9 = (SELECT VSA9 FROM alarm_MAU WHERE alarm_MAU.SRC = alarm_standing_MAU.SRC AND ROWNUM=1) AND alarm_standing_MAU.SRC&lt;&gt;'LastCheck' GROUP BY alarm_standing_MAU.SRC, alarm_standing_MAU.PITIMEDATE, alarm_standing_MAU.VSA6, alarm_MAU.VSA9 ORDER BY alarm_standing_MAU.PITIMEDATE ASC </code></pre>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USa_horse_with_no_name
    1. USainwood
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    2. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COYou have `FROM a` while there is no table `a` in your database. You can't use an alias like that.
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      1. POJoining three tables - issue with alias and Query not properly ended
      1. USypercubeᵀᴹ
    2. COOK = thanks. I'm a bit of a n00b on this. Is the problem that the alias (alarm_MAU AS a) does not get cascaded through to the sub-query?
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      1. POJoining three tables - issue with alias and Query not properly ended
      1. USainwood
 

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