I'm attending the free DB course at Stanford Online, and frankly one of the exercises gave me some trouble. I have a feeling that this should be horribly simple, so for a DBA, I'm obviously not very good with SQL.
We're working with a simplified scenario for rating movies.
For all cases where the same reviewer rated the same movie twice and gave it a higher rating the second time, return the reviewer's name and the title of the movie.
Here's the schema:
Movie ( mID, title, year, director ) Reviewer ( rID, name ) Rating ( rID, mID, stars, ratingDate )
How should I go about this?