PostgreSQL： 一种用于生成随机字符串的方法

create or replace function random_string(integer)

returns text as

$body$

         select array_to_string(array(select substring('0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' FROM (ceil(random()*62))::int FOR 1) FROM generate_series(1, $1)), '');

$body$

language sql volatile;      

来自为知笔记(Wiz)