Returning concatenated string for each acctid

Question

Hi All,
For each acct id, bank statement can be sent to multiple CC EMAIL addresses.
So, for each acct - only one row should appear. I would need to string together cc email addreses for each acct.
Can someone provide code for a function that takes acct_id and loops through all the CC email addresses and for each ACCT_ID passed and returns a concatenated result of
email addresses like "email1, email 2".
GIVEN TABLE:
ACCT EMAIL ADDRESS:
ACCT1 [email protected]
ACCT1 [email protected]
RESULT in report:
ACCT1 [email protected], [email protected]
Need to do it asap.
Regards,

Answer 1

Version? If you are on 11.2 use LISTAGG:
select  acct,
        listagg(email_address,', ') within group(order by email_address) email_address_list
  from  ypour_table
  group by acct
/For example:
with sample_table as (
                      select 'ACCT1' ACCT,'[email protected]' EMAIL_ADDRESS from dual union all
                      select 'ACCT1','[email protected]' from dual
select  acct,
        listagg(email_address,', ') within group(order by email_address) email_address_list
  from  sample_table
  group by acct
ACCT  EMAIL_ADDRESS_LIST
ACCT1 [email protected], [email protected]
SQL> On lower versions:
select  acct,
        rtrim(xmlagg(xmlelement(e,email_address,', ').extract('//text()') order by email_address),', ') email_address_list
  from  your_table
  group by acct
/For example:
with sample_table as (
                      select 'ACCT1' ACCT,'[email protected]' EMAIL_ADDRESS from dual union all
                      select 'ACCT1','[email protected]' from dual
select  acct,
        rtrim(xmlagg(xmlelement(e,email_address,', ').extract('//text()') order by email_address),', ') email_address_list
  from  sample_table
  group by acct
ACCT  EMAIL_ADDRESS_LIST
ACCT1 [email protected], [email protected]
SQL>SY.