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

I agree with Clodoaldo Neto's answer, but also don't forget to add the index

CREATE INDEX testsorting_name on testsorting(upper(left(name,1)), substring(name from 2)::integer)