Versión basada en XML para evitar definir su propia función; requiere 11g para listagg() :
select listagg(word, ' ') within group (order by rn desc) as reversed
from (
select word, rownum as rn
from xmltable('for $i in ora:tokenize($STR, " ") return $i'
passing 'Hello World! I Love StackOverflow' as str
columns word varchar2(4000) path '.'
)
);
REVERSED
----------------------------------------
StackOverflow Love I World! Hello
La XMLTable() hace la tokenización y asigna un número de fila:
select rownum as rn, word
from xmltable('for $i in ora:tokenize($STR, " ") return $i'
passing 'Hello World! I Love StackOverflow' as str
columns word varchar2(4000) path '.'
);
RN WORD
---------- --------------------
1 Hello
2 World!
3 I
4 Love
5 StackOverflow
El listagg() luego vuelve a armarlo en orden inverso.
