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PORemove dupes from recordset excluding columns from dupe condition
 

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    <p>I'm up against a mssql database, having a SQL query like...</p> <pre><code>SELECT id, type, start, stop, one, two, three, four FROM a UNION ALL SELECT id, type, start, stop, one, two, three, four FROM b UNION ALL SELECT id, type, start, stop, one, two, three, four FROM c ORDER BY type ASC </code></pre> <p>Resulting in...</p> <pre><code>row | id type start stop one two three four ----+-------------------------------------------------------------- 1 | 1 a 2010-01-01 2010-01-31 100 1000 1000 100 2 | 1 a 2010-02-01 2010-12-31 100 500 500 50 3 | 1 b 2010-01-01 2010-01-31 100 NULL NULL 100 4 | 1 b 2010-01-01 2010-12-31 100 NULL NULL 100 5 | 1 c 2010-01-01 2010-01-31 0 NULL NULL 100 6 | 1 c 2010-01-01 2010-12-31 0 NULL NULL 100 </code></pre> <p>However, I would much rather prefer the following outcome...</p> <pre><code>row | id type start stop one two three four ----+-------------------------------------------------------------- 1 | 1 a 2010-01-01 2010-01-31 100 1000 1000 100 2 | 1 a 2010-02-01 2010-12-31 100 500 500 50 4 | 1 b 2010-01-01 2010-12-31 100 NULL NULL 100 6 | 1 c 2010-01-01 2010-12-31 0 NULL NULL 100 </code></pre> <p>That is, eliminating row 3 and 5, since they are dupes to row 4 and 6 in every way <strong>but</strong> the <em>stop</em>-column, AND whereas the unfortunate row having to lowest value in the excluding <em>stop</em>-column is to be removed.</p> <p>How can I accomplish this? I've been thinking something like...</p> <pre><code>SELECT * FROM ( SELECT id, type, start, stop, one, two, three, four FROM a UNION ALL SELECT id, type, start, stop, one, two, three, four FROM b UNION ALL SELECT id, type, start, stop, one, two, three, four FROM c ORDER BY type ASC ) AS types GROUP BY ... HAVING ??? </code></pre> <p>I need guidance, please help.</p> <p>(And no, I'm in no position to change any conditions, I've got to work with the given situation.)</p>
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