Procedure to get semicolon seperated values using select query

Question

I have got a requirement where I need to return a string with semi colon separated values. Input will also be a semi colon separated values I need to fetch data from tables and append those values into a string seperated by a semi colon.
Example
CREATE OR REPLACE
PROCEDURE GET_MAIL_IDS_FROM_ROLES
(roleIds IN varchar, mailIds OUT varchar)
select * from xxx where roles in (roleIds )
Thankyou

Answer 1

Haven't tested it, but this could be a start:
CREATE OR REPLACE PROCEDURE GET_MAIL_IDS_FROM_ROLES
(roleIds IN varchar, mailIds OUT varchar)
type mailid is table of owner.xxx.mailid%type indexed by pls_integer;
mail_id mailid;
cursor c1
  select mailid from xxx where roles in (roleIds);
begin
open c1;
fetch c1 bulk collect in mail_id;
mailIds := mail_id(1);
for i in 2 .. mail_id.count loop
   mailIds := mailIds||';'||mail_id(i);
end loop;
close c1;
end;