Best query to get the latest version

Question

Hi,
I have a table as below:
col1 col2 col3.... col_ver col7
I have a combination od values for col1 to col6. I have values in col7 which is different for each value in col_ver. col_ver is a version column.
For a particular combination (col1 to col6) I want to get the rows with the maximum version. Can anyone suggest the best sql for this ?
I have 2 options as below, please suggest from performance point of view which would be better (i don't have enough rows to test) and if there is a any other better way
option 1:
SELECT col1, col2, col3, col4, col5, col6, col_ver, col7
FROM
(SELECT col1, col2, col3, col4, col5, col6, col_ver, col7, MAX(col_ver) OVER (PARTITION BY col1, col2, col3, col4,
col5, col6) MVER
FROM tabA )
WHERE col_ver = MVER;
option2:
SELECT col1, col2, col3, col4, col5, col6, col_ver, col7
FROM tabA A
WHERE col_ver = (SELECT MAX(col_ver) FROM tabA B
WHERE
B.col1 = A.col1
AND B.col2 = A.col2
AND B.col3 = A.col3
AND B.col4 = A.col4
AND B.col5 = A.col5
AND B.col6 = A.col6);
Thanks a lot in adavnce

Answer 1

SQL> with t as
  2  (select 'a1' col1, 'b1' col2, 'c1' col3, 'd1' col4, 1 col_ver,  100 col7
  3     from dual
  4   union all
  5   select 'a1' col1, 'b2' col2, 'c1' col3, 'd1' col4, 1 col_ver,  101 col7
  6     from dual
  7   union all
  8   select 'a1' col1, 'b2' col2, 'c2' col3, 'd1' col4, 1 col_ver,  102 col7
  9     from dual
10   union all
11   select 'a1' col1, 'b2' col2, 'c2' col3, 'd2' col4, 1 col_ver,  103 col7
12     from dual
13   union all
14   select 'a2' col1, 'b1' col2, 'c1' col3, 'd1' col4, 1 col_ver,  104 col7
15     from dual
16   union all
17   select 'a2' col1, 'b2' col2, 'c1' col3, 'd1' col4, 1 col_ver,  105 col7
18     from dual
19   union all
20   select 'a2' col1, 'b2' col2, 'c2' col3, 'd1' col4, 1 col_ver,  106 col7
21     from dual
22   union all
23   select 'a2' col1, 'b2' col2, 'c2' col3, 'd2' col4, 1 col_ver,  107 col7
24     from dual
25   union all
26   select 'a1' col1, 'b1' col2, 'c1' col3, 'd1' col4, 2 col_ver,  108 col7
27     from dual
28   union all
29   select 'a1' col1, 'b2' col2, 'c2' col3, 'd1' col4, 2 col_ver,  109 col7
30     from dual
31   union all
32   select 'a1' col1, 'b2' col2, 'c2' col3, 'd2' col4, 2 col_ver,  110 col7
33     from dual
34   union all
35   select 'a2' col1, 'b2' col2, 'c1' col3, 'd2' col4, 2 col_ver,  111 col7
36     from dual
37   union all
38   select 'a2' col1, 'b2' col2, 'c2' col3, 'd2' col4, 2 col_ver,  112 col7
39     from dual
40   union all
41   select 'a1' col1, 'b2' col2, 'c2' col3, 'd2' col4, 3 col_ver,  113 col7
42     from dual
43   union all
44   select 'a2' col1, 'b1' col2, 'c1' col3, 'd1' col4, 3 col_ver,  114 col7
45     from dual)
46  select * from t;
CO CO CO CO    COL_VER       COL7
a1 b1 c1 d1          1        100
a1 b2 c1 d1          1        101
a1 b2 c2 d1          1        102
a1 b2 c2 d2          1        103
a2 b1 c1 d1          1        104
a2 b2 c1 d1          1        105
a2 b2 c2 d1          1        106
a2 b2 c2 d2          1        107
a1 b1 c1 d1          2        108
a1 b2 c2 d1          2        109
a1 b2 c2 d2          2        110
a2 b2 c1 d2          2        111
a2 b2 c2 d2          2        112
a1 b2 c2 d2          3        113
a2 b1 c1 d1          3        114
15 rows selected.
SQL> -- from here we only need to get those with the lastest value for the col_ver
SQL> with t as
  2  (select 'a1' col1, 'b1' col2, 'c1' col3, 'd1' col4, 1 col_ver,  100 col7
  3     from dual
  4   union all
  5   select 'a1' col1, 'b2' col2, 'c1' col3, 'd1' col4, 1 col_ver,  101 col7
  6     from dual
  7   union all
  8   select 'a1' col1, 'b2' col2, 'c2' col3, 'd1' col4, 1 col_ver,  102 col7
  9     from dual
10   union all
11   select 'a1' col1, 'b2' col2, 'c2' col3, 'd2' col4, 1 col_ver,  103 col7
12     from dual
13   union all
14   select 'a2' col1, 'b1' col2, 'c1' col3, 'd1' col4, 1 col_ver,  104 col7
15     from dual
16   union all
17   select 'a2' col1, 'b2' col2, 'c1' col3, 'd1' col4, 1 col_ver,  105 col7
18     from dual
19   union all
20   select 'a2' col1, 'b2' col2, 'c2' col3, 'd1' col4, 1 col_ver,  106 col7
21     from dual
22   union all
23   select 'a2' col1, 'b2' col2, 'c2' col3, 'd2' col4, 1 col_ver,  107 col7
24     from dual
25   union all
26   select 'a1' col1, 'b1' col2, 'c1' col3, 'd1' col4, 2 col_ver,  108 col7
27     from dual
28   union all
29   select 'a1' col1, 'b2' col2, 'c2' col3, 'd1' col4, 2 col_ver,  109 col7
30     from dual
31   union all
32   select 'a1' col1, 'b2' col2, 'c2' col3, 'd2' col4, 2 col_ver,  110 col7
33     from dual
34   union all
35   select 'a2' col1, 'b2' col2, 'c1' col3, 'd2' col4, 2 col_ver,  111 col7
36     from dual
37   union all
38   select 'a2' col1, 'b2' col2, 'c2' col3, 'd2' col4, 2 col_ver,  112 col7
39     from dual
40   union all
41   select 'a1' col1, 'b2' col2, 'c2' col3, 'd2' col4, 3 col_ver,  113 col7
42     from dual
43   union all
44   select 'a2' col1, 'b1' col2, 'c1' col3, 'd1' col4, 3 col_ver,  114 col7
45     from dual)
46  select a.col1, a.col2, a.col3, a.col4, a.col_ver, a.col7
47    from (select t.col1, t.col2, t.col3, t.col4, t.col_ver, t.col7,
48                 row_number() over (partition by t.col1, t.col2, t.col3, t.col4
49                                    order by t.col_ver desc) rn
50            from t) a
51   where a.rn = 1;
CO CO CO CO    COL_VER       COL7
a1 b1 c1 d1          2        108
a1 b2 c1 d1          1        101
a1 b2 c2 d1          2        109
a1 b2 c2 d2          3        113
a2 b1 c1 d1          3        114
a2 b2 c1 d1          1        105
a2 b2 c1 d2          2        111
a2 b2 c2 d1          1        106
a2 b2 c2 d2          2        112
9 rows selected.
SQL>