Functions DECODE

Question

DB 8.0.1....
Hi,
The decode function is useful for order by, but  I often have problems when table columns differ, e.g. char, number, date.
SQL:
         Select *
         from people
         order by decode(:ORD,'N',name,'C',ID_people,date_born);
error: differ types....
What  is your solution ?
Regards
Jomar

Answer 1

Thanks for the correction
Sth about union all
Elapsed: 00:00:00.85
12:25:06 CTH@XE> with t as
12:30:53 2 ( select 'a'c from dual union all
12:30:53 3 select '1' c from dual union all
12:30:53 4 select '11' c from dual union all
12:30:53 5 select '10' from dual union all
12:30:53 6 select 'A' from dual union all
12:30:53 7 select 'z' from dual union all
12:30:53 8 select 'Z' from dual)
12:30:53 9 select * from t order by ascii(upper(c)), upper(c);
C
1
10
11
A
a
Z
z
7 rows selected.
Elapsed: 00:00:00.01
12:30:54 CTH@XE> with t as
12:31:02 2 ( select 'a'c from dual union
12:31:02 3 select '1' c from dual union
12:31:02 4 select '11' c from dual union
12:31:02 5 select '10' from dual union
12:31:02 6 select 'A' from dual union
12:31:02 7 select 'z' from dual union
12:31:02 8 select 'Z' from dual)
12:31:02 9 select * from t order by ascii(upper(c)), upper(c);
C
1
10
11
A
a
Z
z
7 rows selected.
Elapsed: 00:00:00.00
12:31:02 CTH@XE> with t as
12:31:08 2 ( select 'a'c from dual union all
12:31:08 3 select '1' c from dual union all
12:31:08 4 select '11' c from dual union all
12:31:08 5 --Line duplicate
12:31:08 6 select '11' c from dual union all
12:31:08 7 select '10' from dual union all
12:31:08 8 select 'A' from dual union all
12:31:08 9 select 'z' from dual union all
12:31:08 10 select 'Z' from dual)
12:31:08 11 select * from t order by ascii(upper(c)), upper(c);
C
1
10
11
11
a
A
z
Z
8 rows selected.
Elapsed: 00:00:00.01
12:31:09 CTH@XE>