One of the attendees of my virtual F# in Finance course, Stuart recently asked me a pretty advanced question about writing custom queries with F#, because he was interested in writing a nicer querying library for Amazon DynamoDB (his project is here). I realized that I don't really know about any good resource about doing this, so I wrote a little sample that shows how you can do this. The idea is that we want to be able to write something like this: 1: 2: 3: 4: 5: query { for p in DynamoDB.[...]