Common INSERT errors and fixes in SQL - Mini Project: Build & Apply

Common INSERT Errors and Fixes in SQL

📖 Scenario: You are managing a small bookstore database. You want to add new books to the books table, but sometimes your INSERT commands have errors. You will practice writing correct INSERT statements and fixing common mistakes.

🎯 Goal: Build a series of correct SQL INSERT statements to add new books to the books table, learning how to avoid and fix common INSERT errors.

📋 What You'll Learn

Create the books table with columns id, title, author, and year_published

Write an INSERT statement with all columns specified and correct values

Write an INSERT statement omitting the year_published column and providing only the other columns

Fix an INSERT statement with a missing value error

Fix an INSERT statement with a datatype mismatch error

💡 Why This Matters

🌍 Real World

In real databases, inserting data correctly is essential to keep data accurate and avoid errors that stop your application.

💼 Career

Database administrators and developers must write correct INSERT statements and fix common errors to maintain data integrity and application stability.

1

Create the books table

Write a SQL statement to create a table called books with columns: id as INTEGER PRIMARY KEY, title as TEXT, author as TEXT, and year_published as INTEGER.

SQL

-- Your code here

Need a hint?

Use CREATE TABLE with the exact column names and types.

2

Insert a book with all columns

Write an INSERT statement to add a book with id 1, title 'The Great Gatsby', author 'F. Scott Fitzgerald', and year_published 1925. Specify all columns in the INSERT statement.

SQL

CREATE TABLE books (
  id INTEGER PRIMARY KEY,
  title TEXT,
  author TEXT,
  year_published INTEGER
);
-- Your code here

Need a hint?

Use INSERT INTO books (columns) VALUES (values) with all columns listed.

3

Insert a book omitting year_published

Write an INSERT statement to add a book with id 2, title '1984', and author 'George Orwell', but omit the year_published column. Specify only the columns you provide values for.

SQL

CREATE TABLE books (
  id INTEGER PRIMARY KEY,
  title TEXT,
  author TEXT,
  year_published INTEGER
);

INSERT INTO books (id, title, author, year_published) VALUES (1, 'The Great Gatsby', 'F. Scott Fitzgerald', 1925);
-- Your code here

Need a hint?

List only the columns you provide values for in the INSERT statement.

4

Fix missing value error in INSERT

Fix this INSERT statement that causes a missing value error: INSERT INTO books (id, title, author, year_published) VALUES (3, 'To Kill a Mockingbird', 1960); Add the missing author value 'Harper Lee' in the correct position.

SQL

CREATE TABLE books (
  id INTEGER PRIMARY KEY,
  title TEXT,
  author TEXT,
  year_published INTEGER
);

INSERT INTO books (id, title, author, year_published) VALUES (1, 'The Great Gatsby', 'F. Scott Fitzgerald', 1925);

INSERT INTO books (id, title, author) VALUES (2, '1984', 'George Orwell');

-- Fix the INSERT statement below
INSERT INTO books (id, title, author, year_published) VALUES (3, 'To Kill a Mockingbird', 1960);

Need a hint?

Make sure the number of values matches the number of columns listed.