I checked your profile and it seems like you are building a tool for founders which requires SQL knowledge since it is related to data analytics etc, correct ? I think your Ask HN title is a bit confusing so I wanted to clarify first.
If my understanding is correct, I would say no problem since any SAAS must have at least a senior technical person whether they are founder/co-founder or not. I run a SAAS and I am definitely decent with SQL myself even though I am not the CTO who is obviously better than me at everything technical.