Notes:

Here's a fairly simple SQL query that returns the first 10 people attending Lone Star Ruby Conference 2009.

On the left is the SQL, and on the right is the Sequel ruby code.

Note how the Sequel ruby code doesn't require you to write any SQL.

Also note how Sequel uses ruby symbols to represent SQL tables and columns, and uses ruby strings to represent SQL strings.

Let me quickly break down the different steps.