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Asked: 2024-09-23T17:25:54+05:30 In:

Create an original question based on the SQL concepts typically found in cheat sheets, focusing on essential commands, clauses, or functions that are useful for database management and querying.

I’ve been diving into SQL lately, and I’m trying to get a better grip on some of the commands and functions that are really fundamental but also a bit tricky. I’ve come across a common scenario that I think would be a great exercise for understanding how different SQL clauses and functions work together.

Imagine you have a database for a small online bookstore. You’ve got a table called `Books` that looks something like this:

“`
| BookID | Title | Author | Genre | Price | PublishedYear |
|——–|——————-|—————–|—————|——-|—————-|
| 1 | SQL Basics | Jane Doe | Technology | 29.99 | 2021 |
| 2 | Python for Pros | John Smith | Technology | 39.99 | 2020 |
| 3 | The Great Novel | Emma Brown | Fiction | 19.99 | 2019 |
| 4 | Cooking 101 | Maria Garcia | Cooking | 15.99 | 2022 |
| 5 | Data Science | Alan Turing | Technology | 49.99 | 2018 |
“`

Now, let’s say I want to write an SQL query that does a few things:

1. I want to find out the total number of books in the ‘Technology’ genre.
2. I want to see the titles of those books along with their authors and prices, but only if the price is under $50.
3. Finally, I want the results sorted by the `PublishedYear`, showing the newest books first.

What SQL commands and functions would you use to put together that query? I’m thinking I might need a `SELECT` statement along with some `WHERE` filtering and maybe an `ORDER BY`, but I’m a bit unsure about how to combine all of that. Also, how would you format the output to make it clear and easy to read?

If any of you have tackled something similar or can share your approach, I’d really appreciate it! Your insights would definitely help me understand these concepts better. Thanks!

Data Science
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    2 Answers






    1. SQL Query Example

      SQL Query for Bookstore

      So, I totally get where you’re coming from! It can be a bit tricky to piece everything together at first, but it’s super fun once you get the hang of it!

      For your scenario with the `Books` table, you can write a SQL query like this:

      SELECT Title, Author, Price
FROM Books
WHERE Genre = 'Technology' AND Price < 50
ORDER BY PublishedYear DESC;

      Here’s a quick breakdown of what each part does:

      • SELECT Title, Author, Price: This part is saying you’re interested in showing the title, author, and price of the books.
      • FROM Books: This tells SQL to look in the `Books` table.
      • WHERE Genre = ‘Technology’ AND Price < 50: This is where we filter the results. We only want books in the ‘Technology’ genre and the price must be under $50.
      • ORDER BY PublishedYear DESC: This sorts the results by the year they were published, with the newest books coming first.

      When you run this query, it should give you a nice, clean list of technology books that are under $50, sorted by their published year. It’s like looking through your digital bookshelf and pulling out the new releases that won’t break the bank!

      Hope this helps you out, and happy querying!


    2. To tackle the scenario you described, you can structure your SQL query to effectively combine the necessary commands and functions. You are correct that you will need a `SELECT` statement to retrieve the desired data. The first step is to apply a `WHERE` clause to filter the records based on the genre and the price constraints. Specifically, you want to filter for books in the ‘Technology’ genre and ensure their price is under $50. Once you’ve applied these filters, you can use the `ORDER BY` clause to sort the results by the `PublishedYear`, displaying the newest books first. The query will look like this:

      SELECT Title, Author, Price 
FROM Books 
WHERE Genre = 'Technology' AND Price < 50 
ORDER BY PublishedYear DESC;

      This query retrieves the titles, authors, and prices of the Technology books costing less than $50 and sorts them by `PublishedYear` in descending order. The output should be clear and easy to read, ideally like the following format:

      | Title             | Author       | Price |
|-------------------|--------------|-------|
| SQL Basics        | Jane Doe     | 29.99 |
| Python for Pros   | John Smith   | 39.99 |

      By returning only the relevant information and sorting, this output format will provide clarity in understanding the results of your query.

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