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CREATE TABLE #items (
  part_number int,
  num int,
  description varchar(255)
);

INSERT INTO #items (part_number, num, description) VALUES 
(1, 1, 'xxxxx'),
(1, 2, 'yyyyy'),
(1, 3, 'zzzzz'),
(2, 1, 'aaaaa'),
(2, 2, 'bbbbb'),
(2, 3, 'ccccc');

DECLARE @cols AS NVARCHAR(MAX),
@query  AS NVARCHAR(MAX)

select @cols = STUFF((SELECT ',' + QUOTENAME(description) 
                    from #items
                    group by description, part_number
                    order by part_number
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

set @query = N'SELECT ' + @cols + N' from 
             (
                select num, description
                from #items
            ) x
            pivot 
            (
                max(num)
                for description in (' + @cols + N')
            ) p '

exec sp_executesql @query;

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edited may 30

created may 30 anonymous