What is the best way to optimize schema for capturing attendance data

Question

We have a sports training camp which is regularly attended by various teams in the city. We have a session per day spanning 2 hrs(9-11 AM) and the time slots could vary for

Answer 1

You should ask yourself why you would do that.

There are some possibilities, but it is likely that your database schema won't be fully normalized.

So first of all: what do you want to achieve and what are the reasons for that?

Some possibilities:

• Some DBMS provide the ability to create a user-defined type
• You could use a bitwise approach (in mysql the easiest way for this is using the SET datatype)

But again: what is your current problem, since finding out the number of days someone was present is nothing more than joining the appropriate tables, and aggregate with a count function