Need help in writing an update statement

Question

Hi,
my requirement is as follows..
I have a simple table with just three fields in it
Field_1 Field_2 Field_3
A 1 2
A 0 5
A 2 1
A 3 4
B 1 3
C 2 3
given a value of field_1 i need to select a row that has min(field_2)
in this case the 2nd row from the above table if the value given is "A".
any help will be greatly appreciated.
thanks.

Answer 1

Your subject says "update" but your requirement was a "select" statement.
Don't say I never give any options:
sql>select * from x;
F   FIELD_2   FIELD_3
A         1         2
A         0         5
A         2         1
A         3         4
B         1         3
C         2         3
6 rows selected.
sql>select *
  2    from x t1
  3   where field_1 = 'A'
  4     and field_2 = (select min(t2.field_2)
  5                      from x t2
  6                     where t2.field_1 = t1.field_1
  7                     group by t2.field_1);
F   FIELD_2   FIELD_3
A         0         5
1 row selected.
sql>select *
  2    from x
  3   where (field_1, field_2) in (select field_1, min(field_2)
  4                                  from x
  5                                 where field_1 = 'A'
  6                                 group by field_1);
F   FIELD_2   FIELD_3
A         0         5
1 row selected.
sql>select field_1, field_2, field_3
  2    from (select x.*, row_number() over (order by field_2) rn
  3            from x
  4           where field_1 = 'A')
  5   where rn = 1;
F   FIELD_2   FIELD_3
A         0         5
1 row selected.
sql>select *
  2    from (select *
  3            from x
  4           where field_1 = 'A'
  5           order by field_2)
  6   where rownum = 1;
F   FIELD_2   FIELD_3
A         0         5
1 row selected.