Select a column in a rows

Question

I want to select a column in a row.
suppose,
empno
1
2
3
4
5
I want op like,
1 2 3 4 5

Answer 1

Like this...
SQL> ed
Wrote file afiedt.buf
  1  select max(decode(rn, 1, empno)) as emp1
  2        ,max(decode(rn, 2, empno)) as emp2
  3        ,max(decode(rn, 3, empno)) as emp3
  4        ,max(decode(rn, 4, empno)) as emp4
  5        ,max(decode(rn, 5, empno)) as emp5
  6        ,max(decode(rn, 6, empno)) as emp6
  7        ,max(decode(rn, 7, empno)) as emp7
  8        ,max(decode(rn, 8, empno)) as emp8
  9        ,max(decode(rn, 9, empno)) as emp9
10        ,max(decode(rn, 10, empno)) as emp10
11        ,max(decode(rn, 11, empno)) as emp11
12        ,max(decode(rn, 12, empno)) as emp12
13        ,max(decode(rn, 13, empno)) as emp13
14        ,max(decode(rn, 14, empno)) as emp14
15        ,max(decode(rn, 15, empno)) as emp15
16        ,max(decode(rn, 16, empno)) as emp16
17        ,max(decode(rn, 17, empno)) as emp17
18        ,max(decode(rn, 18, empno)) as emp18
19        ,max(decode(rn, 19, empno)) as emp19
20        ,max(decode(rn, 20, empno)) as emp20
21  from (
22        select empno, row_number() over (order by empno) as rn from emp
23*      )
SQL> /
      EMP1       EMP2       EMP3       EMP4       EMP5       EMP6       EMP7       EMP8       EMP9   EMP10         EMP11      EMP12      EMP13      EMP14      EMP15      EMP16      EMP17      EMP18      EMP19      EMP20
      7369       7499       7521       7566       7654       7698       7782       7788       7839    7844          7876       7900       7902       7934
SQL>