I had a phone interview where the SQL was pretty tough if you don't do anything beyond basic queries and aggregates in your day-to-day work. You should go through some websites and do as many exercises as you can!
Typical SQL questions you find on Google if you type "SQL interview questions."
The following metrics were computed from 1 interview experience for the Meta Data Engineer role in Belgium.
Meta's interview process for their Data Engineer roles in Belgium is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Meta's Data Engineer interview process in Belgium.