Databases starter activity

Here's a quick fun starter which requires no resources or preperation!

When the class enter the room get them to stay standing up. Then ask girls to sit down, then students with blonde hair to sit down, then students with glasses on to site down etc.

Eventually you end up with just a handful of students still remaining. You can then explain that this is the same as a database query. You start with a whole collection of records, you specify certain criteria and you are left with a subset of the original collection.