How can I switch case for each letter in a string with SQL?

Question

I need to convert this into this using PostgreSQL

dxItw9a4 --> DXiTW9A4

Is there any function or way that is already set?

Answer 1

You can use the following methods supported by PostreSQL:

UPPER(string_expression)

Example:

SELECT
   CONCAT (
      UPPER (first_name),
      UPPER (last_name)
   ) as full_name
FROM
   staff;

Reference: http://www.postgresqltutorial.com/postgresql-letter-case-functions/