Here's the deal: You have to know SQL. By all accounts, and according to people within the company, they are no longer hiring people who do not have previous SQL experience. If there is one thing that I can point to that probably cost me the offer, it is that I have not used SQL in a while, and it showed. Everyone with whom I interviewed asked SQL questions. They will give you a set of EMR (Electronic Medical Record) data (2 or 3 tables) and ask questions about how you the tables might be manipulated to provide information. So you not only need to know how to select certain data types and columns to provide insight in theory, but you also must know how to construct the correct select statement. Expect questions on inner/outer joins, unions, subqueries, aggreagtor functions including how to use sum and/or count with group by. If you don't have solid command of SQL and a good bit of fresh, current use, you are probably wasting your time. Yes, SQL is a rather small language in the DML context, and something that can be picked up rather easily, but probably not quickly and completely enough to impress in the interview. Bottom line: don't expect to fake it till' you make it.
