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select replace (replace (replace ('abc', 'a', 'd'), 'b', 'e'), 'c', 'f') result from dual
RESULT
def
create table params (id, key, val) as select 1, 'a', 'd' from dual union all select 2, 'b', 'e' from dual union all select 3, 'c', 'f' from dual
3 rows affected
create or replace type kvarg is object (key varchar2 (32), val varchar2 (32)) /
create or replace type kvargs is table of kvarg /
with function replaceall (str varchar2, kv kvargs) return varchar2 is ret varchar2 (32767) := str; begin for i in 1..kv.count loop ret := replace (ret, kv(i).key, kv(i).val); end loop; return ret; end; param (args) as ( select cast (multiset ( select key, val from params order by id) as kvargs) from dual ) select replaceall ('abc', args) result from dual, param /
RESULT
def