Sample UNPIVOT for 9302743

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WITH reports  
as
(SELECT 1 Report_Number,   123 writer1, 1 loc1,   456 writer2, 2 loc2
UNION SELECT 2,   456, 2,   789, 3
UNION SELECT 3,   789, 3,   123, 1
UNION SELECT 4,   789, 3,   123, 1
UNION SELECT 5,   456, 2,   789, 3
UNION SELECT 6,   123, 1,   456, 2
UNION SELECT 7,   123, 1,   789, 3
UNION SELECT 8,   456, 2,   123, 1
UNION SELECT 9,   789, 3,   123, 1
UNION SELECT 10,  123, 1,   456, 2)


SELECT COUNT(report_number), 
       writer 
FROM   (SELECT report_number, 
               writer1, 
               writer2 
        FROM   reports 
  ) p UNPIVOT (writer FOR writer_type IN ( 
       writer1, 
       writer2) )AS unpvt 
GROUP  BY writer

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