Chapter 4 Lab 1 Error

I was trying to do the Chapter 4 Lab 1 for hours and after three wrong answers I went to look the correct answer.

And for my surprise, it was the exact command that I was using! I copied it and pasted it on the terminal to see if I was writing anything wrong but it gave me the same return: 0.

Why did that happen? And my result of the lab must be reconsidered.

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You are using the wrong database.

The question:

How many zips in the sample_training.zips dataset are neither over-populated nor under-populated?

The dataset name sample_training.zips indicates the collection zips in the database sample_training. By issuing the command

use zips

You started to use the zips database rather than the sample_training database.