How to Join to first row qlikview

[Anonymous]

I have the follwoing script

sales :
Load *

from test.qvd ;

LEFT  JOIN(sales )
IntervalMatch (datecol)
LOAD DISTINCT [DATE DEBUT]
      ,[DATE FIN]
 resident      OC
      ;
      LEFT JOIN (sales )
LOAD *
RESIDENT OC;

I got duplicates rows . so how to Join to first row in qlikview ?

[MK_QSL]

Add one more line

Drop Table OC;