The oracle a table of a data replacement in a data table in a sql statement

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UPDATE isc_specialorg_unit t
  SET t.unicode =
     (SELECT t1.erp_id FROM tmp_wwyt_isc_erp_mapping t1 WHERE t.unicode=t1.isc_code and rownum =1 )
 WHERE EXISTS
     (SELECT 1 FROM tmp_wwyt_isc_erp_mapping T1 WHERE T1.isc_code = T.unicode);     
commit;