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SQL code:
create or replace procedure proc(p_type in varchar2,p_result out varchar2)
as
v_count number;
begin
select count(1) into v_count from tmp
where type=p_type;
if v_count=0 then p_result:='0';
else
select substr(max(sys_connect_by_path(name,',')),2) into p_result from (
select name,row_number()over(order by rownum)rn from tmp
where type=p_type)
connect by prior rn=rn-1
start with rn=1;
end if;
end proc;
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