What is the meaning of select * from xxx where xxx.ttt like’ percentage ~ percentage’ in mysql?

  mysql, question

What is the meaning of select * from xxx where xxx.ttt like’ percentage ~ percentage’ in mysql?

Database encoding GBK

There was a bug in mysql when the database code was GBK, so that sql would not be executed correctly.
The specific performance is
Content containing ~ and y will be searched out.