--字符串序列要这样
declare
type t is table of number(3) index by varchar2(3);
hash_t t;
l_row varchar2(3);
begin
hash_t('a') := 10;
hash_t('b') := 20;
l_row :=hash_t.first;
while(l_row is not null) loop
dbms_output.put_line(hash_t(l_row));
l_row:=hash_t.next(l_row);
end loop;
end;
--数字序列可以这样
declare
type t is table of number(3) index by pls_integer;
hash_t t;
l_row varchar2(3);
begin
hash_t(1) := 10;
hash_t(2) := 20;
for i in hash_t.first .. hash_t.last loop
dbms_output.put_line(hash_t(i));
end loop;
end;