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    <p>Create a helper table Beta:</p> <pre><code> CREATE TABLE Beta ( Monat DATETIME, ) </code></pre> <p>fill it with all monthes you need:</p> <pre><code> INSERT INTO Beta VALUES( '1/1/2010' ) ... INSERT INTO Beta VALUES( '1/12/2010' ) ' maybe '12/1/2010' </code></pre> <p>and:</p> <pre><code> SELECT A.Id, B.Monat, A.Value FROM &lt;YourTable&gt; A, Beta B WHERE B.Monat &gt;= A.StartDate And B.Monat &lt;= A.EndDate </code></pre> <p>(no garanties wrt performance)</p> <p>I did not anticipate that something like this has to be 'proven' - </p> <pre><code> =============================================================================== SO5192555 - select for hungryMind ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- SELECT * FROM Alpha ------------------------------------------------------------------------------- |Id|StartDate|EndDate |Value| | 1| 2/1/2010|6/1/2010| 20| | 2| 5/1/2010|7/1/2010| 80| ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- SELECT A.Id, B.Monat, A.Value FROM Alpha A, Beta B WHERE B.Monat &gt;= A.StartDate And B.Monat &lt;= A.EndDate ------------------------------------------------------------------------------- |Id|Monat |Value| | 1|2/1/2010| 20| | 1|3/1/2010| 20| | 1|4/1/2010| 20| | 1|5/1/2010| 20| | 1|6/1/2010| 20| | 2|5/1/2010| 80| | 2|6/1/2010| 80| | 2|7/1/2010| 80| =============================================================================== xpladolib.vbs: Erfolgreich beendet. (0) [ 0.17969 secs ] </code></pre>
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    1. CONope, my all rows has different start and end date.
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    3. COI cannot create table beta. I have several rows (around a million), I group them to get max and min dates and insert into table beta, and perform query on join, does not seem will give better performance.
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