SQL - 1388字符SQL查询。(一定是更简单的解决方案吗?)

I've wrote an SQL query that should be simple, that turns out is not so simple. I have a database of 1.2 million words (several languages)+ more. My neice asked how many words I can make with 5 letters from the letters jxtehmrungce. I then decided to run a test. Well, turns out it's easy to write a query like this. However!~ There must be an easier solution? The more characters, the longer the query.I've wrote an SQL query that should be simple,