How do I pass the same parameter multiple times in a PostgreSQL function?

Question

This is my function:

create function get_info(p_schema_prefix text)
  returns table (... column definitions go here ...)
as
$$
declare
  l_rec record;
  l_sql text;
begin
  for l_rec in select table_schema, table_name
               from information_schema.tables
               where table_name = 'info'
                 and table_schema like p_schema_prefix||'%'
  loop 
    l_sql := format('select id, data from %I.%I', l_rec.table_schema, l_rec.table_name);
    return query execute l_sql;
  end loop;
end;
$$
language plpgsql;

In the firste line inside the loop I have a format select string format('select id, data from %I.%I', l_rec.table_schema, l_rec.table_name); . How do I refer to l_rec.table_schema more than once? I know the first %I refers to the first parameter and the second %I refers to the second. However I want to refer to the first parameter multiple times, how do I do that?

Answer 1

你没有——只是多次使用相同的论点。