How to test if a character is a number

Question

Hi all.
Anyone got an idea on what is the most efficient way to test if a character is a numeric character (0...9) in pl/sql.
Thanks

Answer 1

SQL> ed
Wrote file afiedt.buf
  1  with t as (select '0' as chr from dual union all
  2             select '3' from dual union all
  3             select 'A' from dual union all
  4             select 'x' from dual union all
  5             select '8' from dual union all
  6             select 'w' from dual)
  7  -- END OF TEST DATA
  8  select chr
  9        ,CASE WHEN regexp_like(chr,'^[0-9]$') THEN 'Number'
10         ELSE 'Not Number'
11         END as test
12* from t
SQL> /
C TEST
0 Number
3 Number
A Not Number
x Not Number
8 Number
w Not Number
6 rows selected.
SQL>