Introduction to SQL

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Introduction to SQL

Introduction to SQL

1. Getting Started

What is SQL?Setting Up SQL and SSMS Getting Familiar with SSMS Structure of an SQL Database System The SELECT Statement Challenge: First Day as a Librarian Challenge: Find all Book Titles Challenge: Find Book Titles and Authors The DISTINCT Keyword Challenge: Find all Genres

2. Filtering Data

The WHERE Clause Challenge: Help a Reader Find Their Favorite Genre Challenge: Fetching Older Books Conditional Expressions: Comparison Operators Challenge: Avoid the Damaged Books Challenge: Highlight New Arrivals Challenge: Budget-Friendly Books Conditional Expressions: The AND Operator Challenge: Find Specific Books for a Reader Challenge: Defining Ranges Challenge: Multiple Conditions Conditional Expressions: The OR Operator Challenge: Matching Multiple Options Challenge: Excluding A Range Conditional Expressions: The NOT Operator Challenge: Negating a Range

3. Sorting Data

Basic Sorting Challenge: Sorting the Library Catalogue Sorting by Multiple Columns Challenge: Further Sorting the Catalogue Sorting after Filtering Data Challenge: Find the Cheapest Books Challenge: Help a Customer Find a Book The LIMIT Keyword Challenge: Select Books for the Collector's Section Challenge: Affordable Books

4. Populating a Database

Creating a Table Challenge: Creating a new Books Table Inserting Rows into a Table Challenge: Inserting Data Challenge: Inserting More Data Inserting Multiple Rows Challenge: Inserting Bulk Data Primary Keys The SERIAL Keyword Challenge: Changing the Books Structure Specifying Default Values Challenge: Further Improving the Books Table

5. Updating & Deleting Data

Updating Rows in a Table Challenge: Correct Book's Data Challenge: Updating Page Counts Challenge: Mark Archived Books As Unavailable Deleting Rows Challenge: Deleting Outdated Records Duplicating Tables Challenge: Create a Table Backup Challenge: Generate a Summarized Books Table Deleting Tables

Challenge: Further Sorting the Catalogue

In the last task, you were helping a customer look through books.

Following was the query we came up with:

Since there are too many books in the library catalogue, it is hard for the customer to find a relevant book even after sorting by publication_year, since many books can have the same publication year.

You can further sort the books to make the results much easier to look through. For example, you can sort them by Genre, and then by the Title.

In places where multiple books have the same Publication Year, the query will sort the rows by Genre, and in case some of those rows have the same Genre, they'll be further sorted by the Title.

Завдання

Swipe to show code editor

Your task is to modify the query such that the fetches books are sorted according to the following columns (in the given order):

publication_year in descending order;
genre in ascending order;
title in ascending order.

Рішення

Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів

Все було зрозуміло?

Дякуємо за ваш відгук!

Секція 3. Розділ 4

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Challenge: Further Sorting the Catalogue

In the last task, you were helping a customer look through books.

Following was the query we came up with:

Since there are too many books in the library catalogue, it is hard for the customer to find a relevant book even after sorting by publication_year, since many books can have the same publication year.

You can further sort the books to make the results much easier to look through. For example, you can sort them by Genre, and then by the Title.

In places where multiple books have the same Publication Year, the query will sort the rows by Genre, and in case some of those rows have the same Genre, they'll be further sorted by the Title.

Завдання

Swipe to show code editor

Your task is to modify the query such that the fetches books are sorted according to the following columns (in the given order):

publication_year in descending order;
genre in ascending order;
title in ascending order.

Рішення

Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів

Все було зрозуміло?

Дякуємо за ваш відгук!

Секція 3. Розділ 4

Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів

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