Alphanumeric case in-sensitive sorting in postgres

Question

I am new to postrges and want to sort varchar type columns. want to explain the problem with with below example:

table name: testsorting

   order             


        

Answer 1

As far as I'm concerned, I have used the PostgreSQL module citext and used the data type CITEXT instead of TEXT. It makes both sort and search on these columns case insensitive.

The module can be installed with the SQL command CREATE EXTENSION IF NOT EXISTS citext;