Interview Prep for SQL round at Google

Hello! I am interviewing for Senior Business intelligence Analyst role at Google and after clearing the screening round where the recruiter asked very basic technical question, I have been moved to the second round which is going to be a SQL round. Can anybody who has previously interviewed for this or similar roles at Google help me with kind of questions that might be asked in this round? Any particular topics that I must study before the interview. Also please share any general tips regarding interviewing at Google as well. Thanks a ton! #google #dataanalytics #interview #bianalyst