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POJoining many tables on same data and returning all rows
 

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    <h2>UPDATE:</h2> <p>my orgional attempt to use FULL OUTER JOIN did not work correctly. I have updated the question to reflex the true issue. Sorry for presenting a classic <a href="http://www.perlmonks.org/index.pl?node_id=542341" rel="nofollow">XY PROBLEM</a>.</p> <hr> <p>I'm trying to retrieve a dataset from multiple tables all in one query thats is grouped by year, month of the data.</p> <p>The final result should look like this:</p> <pre> | Year | Month | Col1 | Col2 | Col3 | |------+-------+------+------+------| | 2012 | 11 | 231 | - | - | | 2012 | 12 | 534 | 12 | 13 | | 2013 | 1 | - | 22 | 14 | </pre> <p>Coming from data that looks like this:</p> <p><strong>Table 1:</strong></p> <pre> | Year | Month | Data | |------+-------+------| | 2012 | 11 | 231 | | 2012 | 12 | 534 | </pre> <p><strong>Table 2:</strong></p> <pre> | Year | Month | Data | |------+-------+------| | 2012 | 12 | 12 | | 2013 | 1 | 22 | </pre> <p><strong>Table 3:</strong></p> <pre> | Year | Month | Data | |------+-------+------| | 2012 | 12 | 13 | | 2013 | 1 | 14 | </pre> <p>I tried using <code>FULL OUTER JOIN</code> but this doesn't quite work because in my <code>SELECT</code> clause because no matter which table I select 'Year' and 'Month' from there are null values.</p> <pre><code>SELECT Collase(t1.year,t2.year,t3.year) ,Collese(t1.month,t2.month,t3.month) ,t1.data as col1 ,t2.data as col2 ,t3.data as col3 From t1 FULL OUTER JOIN t2 on t1.year = t2.year and t1.month = t2.month FULL OUTER JOIN t3 on t1.year = t3.year and t1.month = t3.month </code></pre> <p>Result is something like this (is too confusing to repeat exactly what i would get using this demo data):</p> <pre> | Year | Month | Col1 | Col2 | Col3 | |------+-------+------+------+------| | 2012 | 11 | 231 | - | - | | 2012 | 12 | 534 | 12 | 13 | | 2013 | 1 | - | 22 | | | - | 1 | - | - | 14 | </pre>
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    1. COIt was really hard for the to put the title of this question into words. If you can think of a better one please edit!
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    2. COJust realized the FULL OUTER JOIN does not even work for what i want to do. For example if i choose to join each table on t1.year and t1.month then if t2 and t3 share dates that do not exist in t1 then it doesn't join correctly
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    3. COBTW this question could really use a better name now... Any suggestions?
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