Speed for query

Question

Dear all,
If i want to select data from the table that without index.
whice statement that i should be used for the better speed between
"select * from table" or "select count(*) from table" ?
Thanks for advance
Chara

Answer 1

Except the different result, a test is easy :
SQL> ed
Wrote file afiedt.buf
  1  begin
  2  for i in 1..100000 loop
  3      insert into ct values (i);
  4  end loop;
  5* end;
  6  /
PL/SQL procedure successfully completed.
SQL> set timi on
SQL> set autot traceonly explain stat
SQL> select count(*) from ct;
Elapsed: 00:00:00.00
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE
   1    0   SORT (AGGREGATE)
   2    1     TABLE ACCESS (FULL) OF 'CT'
Statistics
          0  recursive calls
          0  db block gets
        156  consistent gets
          0  physical reads
          0  redo size
        406  bytes sent via SQL*Net to client
        499  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          1  rows processed
SQL> select * from ct;
100000 rows selected.
Elapsed: 00:00:01.00
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE
   1    0   TABLE ACCESS (FULL) OF 'CT'
Statistics
          0  recursive calls
          0  db block gets
       6823  consistent gets
          0  physical reads
          0  redo size
    1415959  bytes sent via SQL*Net to client
      73825  bytes received via SQL*Net from client
       6668  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
     100000  rows processed
SQL> Nicolas.