Goats love databases. They like nothing better than writing SQL queries.
Cthulhu teaches an SQL class. It had an idea for improving a lesson. It gave some goats the old lesson, then a test (the "before" test), then the new lesson, then another test (the "after" test). What happened to the scores?
Download the starting worksheet with the data. It's like this:
Notice that scores can go down. That's normal; scores have some randomness to them.
Each record has three values:
- Name.
- Before. Number, zero or more.
- After. Number, zero or more.
Some data might not fit the rules. You'll need to validate it.
Write a program to compute averages and counts. Here's the output.
Your program should warn the user if more than 10% of the records are invalid. Don't forget to remove the message each time the program runs.
Upload your solution. The usual standards apply.