Question

I have a table with an email address column. Some email addresses in the table contain uppercase letters. I would like to fetch all the rows with uppercase emails (in order to set them to lowercase). How do I select all the rows where the email address contains uppercase letters?

Answer 1

I believe Oracle is case sensitive by default? If so, then this should work:

SELECT *
FROM table_name
WHERE LOWER(email) <> email

If this works then you can simply update them with

UPDATE table_name
SET email = LOWER(email)
WHERE LOWER(email) <> email