title: Query a single value with Hash and Range? (Amazon DynamoDB)
body: <p>This may seem like a dumb question but: As I understand, a hash and range key combined act as a way to uniquely identify an item in a table.  However, every example I've seen of database, as well as the query documentation shows querying with the hash and/or range key to return multiple values.  How do I use the range and hash to query (or some other operation) for a single item?</p>