去重分页sql语句

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SELECT 
    [TAGNAME] 
FROM (
        SELECT      
            tagname,ROW_NUMBER() OVER(order by tagname) AS RowNumber        
        FROM 
            (SELECT DISTINCT(tagname) FROM H201402_Hour)    
        AS S
        )
        AS T 
WHERE RowNumber BETWEEN 1 and 20

 

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