“We need to make sure users who purchased have enough books to read, otherwise they’ll cancel their subscriptions!” said Gessica, “How many books do we have in Bindle’s library?”
So far we’ve been working only with the
users table –it’s time to move on and learn about the new table –
books (in the end, Bindle is a subscription service for reading books).
Let’s start simple and answer the questions: “How many books do we have in total?” (read: how many book records are in the