Unfortunately this info is about SQL Server which is a database product from Microsoft as opposed to the SQL language which I think is what pooj is looking for. And I didn't see any forum of that site which looked like it could help.
Looking at the wiki page, you probably have to concentrate on the query, data type and data manipulation sections assuming you are interviewing for some type of analyst job where you may have to query tables. You show also understand what a primary and foreign key is.
Don't have time right now to expound on this, maybe later I will if you want to ask some questions.