Is there built-in function in Oracle DB 11g r2 that could parse varchar2 variable to table? Opposite of listagg or wm_concat. I found only Tom Kyte's method dated 2006:
with data as
(
select trim(substr (txt, instr(txt, ',', 1, level) + 1
, instr(txt, ',', 1, level + 1) - instr(txt, ',', 1, level) - 1)) as token
from (select ',' || :txt || ',' txt from dual)
connect by level <= length(:txt) - length(replace(:txt, ',', '')) + 1
)
select * from data;
I think Oracle must have simpler way.
No.
I would simplify Tom's method slightly, but not by much; you can now use regular expressions as well:
select regexp_substr(:txt, '[^,]+', 1, level)
from dual
connect by regexp_substr(:txt, '[^,]+', 1, level) is not null
SQL Fiddle
Ben's regexp_substr solution is generally the preferred solution. If your string happens to consist of strings that are valid Oracle identifiers-- they are less than or equal to 30 characters and begin with an alphabetic character, you can also use the dbms_utility.comma_to_table function. Given those limitations, however, it's generally better to use the general-purpose solution.
SQL> ed
Wrote file afiedt.buf
1 declare
2 l_string varchar2(1000) := 'foo,bar,b123,FuzzyBunny,abcdefghij12345678901234567890';
3 l_num pls_integer;
4 l_arr dbms_utility.uncl_array;
5 begin
6 dbms_utility.comma_to_table( l_string, l_num, l_arr );
7 for i in 1..l_arr.count
8 loop
9 dbms_output.put_line( l_arr(i) );
10 end loop;
11* end;
SQL> /
foo
bar
b123
FuzzyBunny
abcdefghij12345678901234567890
PL/SQL procedure successfully completed.
