sql - select only some rows when multiple columns duplicates -


i want select 1 set of rows when have 3 specific columns duplicates. example, in table, want 1 of 2 quotes show copies. 

quotenumber|linenumber|billtocustomer|purchaseorder|creationdate|item ...........|..........|..............|.............|............|......... 11         | 1        | john         | 35          | 2014-04-09 | x1234  11         | 2        | john         | 35          | 2014-04-09 | x5678 12         | 1        | john         | 35          | 2014-04-09 | x1234  12         | 2        | john         | 35          | 2014-04-09 | x5678-2

so have that:

select * vgqesheader qh left join vgqesdetail qd on qh.link = qd.quotelink

and criteria put:

qd.linenumber='1'   count(qh.billtocustomer)>1  count(qh.purchaseorder)>1  count(qh.creationdate)>1

and no clue how it.

i tried not doesn't seem work.

edit : expected output:

quotenumber|linenumber|billtocustomer|purchaseorder|creationdate|item ...........|..........|..............|.............|............|......... 11         | 1        | john         | 35          | 2014-04-09 | x1234  11         | 2        | john         | 35          | 2014-04-09 | x5678

try this:

;with cte (select *, row_number() on (partition linenumber order quotenumber) rn tbl) select quotenumber, linenumber, billtocustomer, purchaseorder, creationdate, item  cte rn = 1

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