When working with text data is extremely important to know whether our data is always in lower case or it’s arbitrary.
It’s way easier to write regular expressions for lower cased data (we can ignore
[A-Z] characters) and often it’s safer to count or compare strings in lower case. Imagine, we’d have firstname.lastname@example.org and FOOBAR@gmail.com emails in our database – it’s a , because technically these emails are the same.
Let’s check if all emails in the
users table are lower-cased. Submit TRUE if they’re all lower-cased and FALSE otherwise.