FROM keyword not found where expected (Oracle) ORA-00923

ora 923SQL Error: ORA-00923: FROM keyword not found where expected. Can anyone tell me where I'm going wrong with this? you don't need the WITHIN GROUP clause. it's okORA-00923: FROM keyword not found where expected SQL: SELECT DISTINCT B10.EMPLID from PS_BEN_PROG_PARTIC a10, PS_EMPLOYEES b10,