Cockroach Labs Technical Support Engineer interview questions

I applied online and got an invitation to do a 20 minute phone screen with recruiter. The call went great , they went through some of their 'open sourced phone screen' interview process questions. Mostly it was about the company and questions about my past employment. From here they sent a 'take home assessment' asking 3 support related questions relating to issues specific to SQL/CRDB. I submitted my answers but later got a rejection email. I would advise to have SQL experience ( understanding statements and troubleshooting issues related to SQL) when applying for this role.