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developer-roadmap/src/data/courses/sql/chapters/sql-basics/lessons/challenge-5.md

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title description order type initSteps expectedResults
Challenge 5 Write a SQL query to find the total number of orders in the `orders` table. 500 challenge [CREATE TABLE books ( id INTEGER PRIMARY KEY, title TEXT, genre TEXT, price REAL, stock INTEGER, year INTEGER ); INSERT INTO books (id, title, genre, price, stock, year) VALUES (1, 'The Great Adventure', 'Fiction', 15.99, 12, 2020), (2, 'Mystery of the Night', 'Mystery', 12.50, 5, 2018), (3, 'Science Explained', 'Science', 20.00, 0, 2019), (4, 'Cooking Made Easy', 'Cooking', 18.99, 8, 2021), (5, 'History Revisited', 'History', 10.99, 20, 2017), (6, 'Fictional Reality', 'Fiction', 25.99, 3, 2022);] {columns [id title genre price stock year]} {values [[1 The Great Adventure Fiction 15.99 12 2020] [3 Science Explained Science 20 0 2019}]]

Given the following books table:

id title genre price stock year
1 The Great Adventure Fiction 15.99 12 2020
2 Mystery of the Night Mystery 12.50 5 2018
3 Science Explained Science 20.00 0 2019
4 Cooking Made Easy Cooking 18.99 8 2021
5 History Revisited History 10.99 20 2017
6 Fictional Reality Fiction 25.99 3 2022

Write a query to retrieve books that meet the following criteria and order them as specified:

  • The genre must be either Fiction or Science.
  • The price should be >= 10 and <= 20.

Here are the sorting requirements:

  • First, sort the results by stock in descending order (books with more stock appear first).
  • If two books have the same stock, sort them by price in ascending order.

Expected Results

id title genre price stock year
1 The Great Adventure Fiction 15.99 12 2020
3 Science Explained Science 20.00 0 2019