sql - How to query list of unique records from many to one relationship data structure? -

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i having trouble finding suitable query in sql server. have department(table a) having many clients(table b) data structure. looking query retrieve 1 client(first occurrence) of each department client status active. help?

try 

select *  table1 t1       exists      (         select * table2 t2          t1.column1 = t2.column1 , column2 = 1     )     , exists     (         select * table2 t2          t1.column1 = t2.column1 , column2 = 2     );

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