Done when

Query 2 returns "Learning SQL, week 3" first and "Indexes: a field guide" fifth.
Query 3 starts with "Hello world".
Query 4 returns 4 rows, one of them a draft.
Query 5 returns 2 rows.
Query 6 returns 3 comments, by bob, dev, then alice.
Query 7 returns 6 rows.
Query 8 returns 6 rows, all by alice or bob.