How to reverse a column

Question

Hi All,
I have a table test. The data is as given below
x y z
1 4 7
2 5 8
3 6 9
i want to reverse the column y
the output should be
x y z
1 6 7
2 5 8
3 4 9
Thanks,
Vikas

Answer 1

Like this perhaps?
SQL> select * from test_rev;
         X          Y          Z
         1          4          7
         2          5          8
         3          6          9
SQL> update test_rev set y = (select y from test_rev tr where x = (3-test_rev.x)+1);
3 rows updated.
SQL> select * from test_rev;
         X          Y          Z
         1          6          7
         2          5          8
         3          4          9
SQL>But obviously this relies on X being a complete sequence. If that's not the case then you need to provide us with more information and better sample data.