Like the others below/above I agree that you should certainly know SQL if you're going to use an ORM. ORMs can be a really great tool if you use them correctly.

Like the others below/above I agree that you should certainly know SQL if you're going to use an ORM. ORMs can be a really great tool if you use them correctly. More to your point, I think the problem is the vast number of developers using ORMs without knowing SQL and running into big problems with correctness and performance.