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PODynamically create ranges from numeric sequences
 

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    <p>I have a table like the following:</p> <pre><code>+----+-----+-----+ | ID | GRP | NR | +----+-----+-----+ | 1 | 1 | 101 | | 2 | 1 | 102 | | 3 | 1 | 103 | | 4 | 1 | 105 | | 5 | 1-2 | 106 | | 6 | 1-2 | 109 | | 7 | 1-2 | 110 | | 8 | 2 | 201 | | 9 | 2 | 202 | | 10 | 3 | 300 | | 11 | 3 | 350 | | 12 | 3 | 351 | | 13 | 3 | 352 | +----+-----+-----+ </code></pre> <p>I wanted to create a view which groups this list by <code>GRP</code> and concatenates values in <code>NR</code>. Is it possible to dynamically detect sequences and shorten them into ranges? Like <code>1, 2, 3, 5</code> would become <code>1-3, 5</code>.</p> <p>So the result should look like this:</p> <pre><code>+-----+--------------------+ | GRP | NRS | +-----+--------------------+ | 1 | 101 - 103, 105 | | 1-2 | 106, 109 - 110 | | 2 | 201 - 202 | | 3 | 300, 350 - 352 | +-----+--------------------+ </code></pre> <p>What i got now is simply concatenate values, so the table above would become this:</p> <pre><code>+-----+--------------------+ | GRP | NRS | +-----+--------------------+ | 1 | 101, 102, 103, 105 | | 1-2 | 106, 109, 110 | | 2 | 201, 202 | | 3 | 300, 350, 351, 352 | +-----+--------------------+ </code></pre> <p>Here's the actual statement:</p> <pre><code>DECLARE @T TABLE ( ID INT IDENTITY(1, 1) , GRP VARCHAR(10) , NR INT ) INSERT INTO @T VALUES ('1',101),('1',102),('1',103),('1',105) ,('1-2',106),('1-2',109), ('1-2',110) ,('2',201),('2',202) ,('3',300),('3',350),('3',351),('3',352) SELECT * FROM @T ;WITH GROUPNUMS (RN, GRP, NR, NRS) AS ( SELECT 1, GRP, MIN(NR), CAST(MIN(NR) AS VARCHAR(MAX)) FROM @T GROUP BY GRP UNION ALL SELECT CT.RN + 1, T.GRP, T.NR, CT.NRS + ', ' + CAST(T.NR AS VARCHAR(MAX)) FROM @T T INNER JOIN GROUPNUMS CT ON CT.GRP = T.GRP WHERE T.NR &gt; CT.NR ) SELECT NRS.GRP, NRS.NRS FROM GROUPNUMS NRS INNER JOIN ( SELECT GRP, MAX(RN) AS MRN FROM GROUPNUMS GROUP BY GRP ) R ON NRS.RN = R.MRN AND NRS.GRP = R.GRP ORDER BY NRS.GRP </code></pre> <p>Can anyone tell me if it's easily possible to do something like that? Would be great if anyone has an idea and would like to share it.</p>
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