Korrekt sortering af punkterede tal gemt som tegn i SQL Server

Hvis du har SQL 2008, kan du bruge den nye hierarkiske datatype:

WITH Items (ItemNumber) AS (
    SELECT '1' UNION ALL SELECT '1.1' UNION ALL SELECT '1.1.1'
    UNION ALL SELECT '10' UNION ALL SELECT '11' UNION ALL SELECT '2'
    UNION ALL SELECT '2.1' UNION ALL SELECT '20' UNION ALL SELECT '3'
    UNION ALL SELECT '30'
)
SELECT *
FROM Items 
ORDER BY Convert(hierarchyid, '/' + ItemNumber + '/');