How to use substring in order by

Question

I have the following query to select the domain names that have three levels separated by two dots:

select domainname from db.table
where criteria like (\'*.com\         


        

Answer 1

Check out the SUBSTRING_INDEX() function:

select domainname from db.table
where criteria like ('*.com')
AND domainname like ('%.%.%')
ORDER BY SUBSTRING_INDEX(domainname, '.', -2);