Just be prepared with an answer like, "Don't panic. Be prepared to adjust to change quickly and with positivity and have your brain in gear to come up with a solution. And always lean towards safety, not risky, and whatever you do, put a positive spin on it. (Lights are out? Fantastic! It's not often we get to do our meeting outdoors! Perfect weather too! We will get you the facts you need to know today and then we will reschedule the greater part of this meeting for another day when the power is more cooperative!)
1. If lights out - it's not going to work we still have to fhinish the class. Wait a few minutes and then ask everyone to stay seated if is really dark for safety's sake/ I call maintenance or custodian or collegue to find out whats going on so I can decide how to proceed 2.Computer locks up, I love computers, don't you -- Okay lets take a 15 minute break while I get this resolved. 3. Class out of control, Everyone lets get back on topic, we need to make it through this section and then we'll take a break. If there is a particular person who is disruptive then at the break I'll pull them aside and ask them to discuss their issues with me in private and to refrain from disruping the class or I'll have to ask them to leave.
I knew the basic of indexes, views and joins, so I could answer those questions. Improving efficiency of query was difficult question to answer - I just said make indexes, read the query and try to reduce hits on table. I had no idea how to write SQL programmes.
I was honest and said that I wasn't sure, but I knew the numbers I could call if I ran into a problem (manager, assistant manager, GM, and other employees). That seemed to be the right answer. They would much rather have you ask a simple question than make a small mistake that could be a bigger one down the road.