sql - select unique values in one column and match with the criteria in another column -


need group table below (1) ouput table (2) these sample values, in real they're corresponding numbers , code. id should unique , code should match criteria ( if xz exists xz; if xz , xy exists select xy , on) tried 'if exists' , 'case when..then' not luck far, since both column have pk . use sql server 2008, thanks

 id   code 101   xz 102   xz 102   xy 103   xz 103   xa  output 101  xz 102  xy 103  xa

study ranking functions , of great in grouping queries.

with cte (  select id,code,        row_number() over(partition id order code) row tablename )  select id,code cte row=1

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