Having gone over the basics of queries again using a totally different database, this is something where I get students to have a group discussion before going away and doing their 'own thing' and having to justify it in their brief write up or eportfolio commentaries. They could use single or multiple codes eg U Or UP Or UT or G, etc, (or wildcards), they could choose some of the topics that might be relevant too (eg cyberbullying. chat, etc) possibly combining thereby refining selection........ This allows for differentiation - there is no single right answer. Its worth telling the students this too.