FAQ: Manipulation - Constraints

This community-built FAQ covers the “Constraints” exercise from the lesson “Manipulation”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Web Development
Data Science

Learn SQL

FAQs on the exercise Constraints

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In the lesson we deleted rows from the celebs table, but after the final exercise, the database schema still lists four rows. Why? Thank you.

If there is a constraint violation from attempting to insert data into a table that doesn’t fit the constraints, will an error message appear or will that data simply not be entered?

This is important because if the data isn’t entered and there is no error message, the developer may not know that some data wasn’t placed into the table.