collation - how to search for exact string in mysql

Question

I'm trying to search for an exact match of a string in mysql. The string is 'nrew'. But when I do the queries below, I still get a result:

SELECT UserID FROM sys_users WHERE UserID='NREW'
SELECT UserID FROM sys_users WHERE UserID='NrEw'

Please help.

Answer 1

SELECT UserID FROM sys_users WHERE BINARY UserID='NREW'