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    <p>The WHERE filter may be wrong. Note that first datetime in the condition starts at '08:00:00' -</p> <pre><code>SELECT FROM_UNIXTIME('1346475600') dt1, FROM_UNIXTIME('1348290000') dt2; +---------------------+---------------------+ | dt1 | dt2 | +---------------------+---------------------+ | 2012-09-01 08:00:00 | 2012-09-22 08:00:00 | +---------------------+---------------------+ </code></pre> <p>The type of <code>ActualEffort</code>.<code>logdate</code> field is DATE; the value '2012-09-01' is less then '2012-09-01 08:00:00'. So change this condition or use DATE function -</p> <pre><code>WHERE E.logdate BETWEEN DATE(FROM_UNIXTIME('1346475600')) AND DATE(FROM_UNIXTIME('1348290000')) </code></pre> <hr> <p><strong>(edited)</strong></p> <p>For one thing, when you join <code>StaffAssign</code> and <code>ActualEffort</code> on the <code>Tid</code> column only, you get a mini-<a href="http://en.wikipedia.org/wiki/Cartesian_product" rel="nofollow" title="Cartesian product (Wikipedia)">Cartesian product</a> for <code>Tid=123</code> in particular, because both tables contain more than one row with that <code>Tid</code> and there's no other specific condition to establish a 1:1 or, at most, 1:N relationship between the rows.</p> <p>But in fact, 1:N wouldn't do either: although it wouldn't give you the Cartesian product effect, it would result in duplicated values on one side and, as a consequence, in a distorted SUM.</p> <p>Therefore, data in <code>StaffAssign</code> and those in <code>ActualEffort</code> must be aggregated separately, <em>then</em> joined, something like this:</p> <pre><code>SELECT pl.ProjectId, pn.name, sa.Planned, ae.ActualEffort FROM ProjectList pl JOIN ProjectName pn ON pn.Id = pl.ProjectId LEFT JOIN (SELECT Tid, SEC_TO_TIME(SUM(TIME_TO_SEC(Planned))) Planned FROM StaffAssign GROUP BY Tid) sa ON sa.Tid = pl.Tid LEFT JOIN (SELECT Tid, SEC_TO_TIME(SUM(TIME_TO_SEC(ActualEffort))) ActualEffort FROM ActualEffort GROUP BY Tid) ae ON ae.Tid = pl.Tid GROUP BY ProjectId; </code></pre>
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    1. COEven After removing the 'where' filter also its not working.
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    2. COTake a look at the answer.
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    3. COI took the liberty of editing your answer with what I was about to post myself. Please feel free to roll back my changes or edit them as you see fit.
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