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Table definitions for 3rd Normal Form

Recall the definition of the school table from the previous exercise:

CREATE TABLE school (
    id serial PRIMARY KEY,
    name VARCHAR(100) NOT NULL,
    street_address VARCHAR(100) NOT NULL,
    city VARCHAR(50) NOT NULL,
    state VARCHAR(50) NOT NULL,
    zip_code INTEGER NOT NULL
)

We can define a new table called zip to help satisfy 3rd Normal Form.

This exercise is part of the course

Creating PostgreSQL Databases

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Exercise instructions

  • Add a PRIMARY KEY named code to complete the definition of the zip table.
  • Update the definition of school to satisfy 3NF.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

-- Complete the definition of the table for zip codes
CREATE TABLE zip (
	___ INTEGER ___ ___,
    city VARCHAR(50) NOT NULL,
    state VARCHAR(50) NOT NULL
);

-- Complete the definition of the "zip_code" column
CREATE TABLE school (
	id serial PRIMARY KEY,
    name VARCHAR(100) NOT NULL,
    street_address VARCHAR(100) NOT NULL,
    zip_code INTEGER REFERENCES ___(___)
);
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