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declare    
    v_isexist number(3,0):=0;  
begin  
    select count(1) into v_isexist from sys.all_objects where owner = 'TEST' and object_type = 'TABLE' and object_name = 'TAB1';
    if  v_isexist>0 then  
        dbms_output.put_line('exists');  
    else  
        dbms_output.put_line('not exists');            
    end  if;  
end;