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

If the name is always in the 1 alpha followed by n numerics format then:

select name
from testsorting
order by
    upper(left(name, 1)),
    (substring(name from 2) || '0')::integer