Transformasi numerik & string

Dalam latihan ini, Anda berencana menjalankan promosi diskon 50% untuk film yang dirilis sebelum tahun 2006. Untuk mempersiapkan promosi ini, Anda perlu menampilkan film-film yang memenuhi syarat, dan agar judulnya lebih mudah dibaca, ubahlah semua judul menjadi huruf kecil. Anda juga perlu menampilkan original_rate dan sale_rate.

Latihan ini adalah bagian dari kursus

Menerapkan SQL pada Masalah Dunia Nyata

Lihat Kursus

Petunjuk latihan

Tampilkan title film dalam huruf kecil menggunakan LOWER.
Tampilkan rental_rate asli dan sale_rate dengan diskon 50% dengan mengalikan rental_rate dengan 0.5.
Pastikan hanya film sebelum 2006 yang dipertimbangkan untuk promosi ini.

Latihan interaktif praktis

Cobalah latihan ini dengan menyelesaikan kode contoh berikut.

SELECT ___ AS title, 
  ___ AS original_rate, 
  ___ * ___ AS sale_rate 
FROM film
-- Filter for films prior to 2006
___;

Edit dan Jalankan Kode

Latihan ini adalah bagian dari kursus

Menerapkan SQL pada Masalah Dunia Nyata

SkillTag.level.intermediateSkillTag.label

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Mulai Kursus Gratis

You will review some of the most commonly used SQL commands to ensure you are prepared to tackle both real-world problems as well as every exercise covered in this course.

Exercise 1: SQL Esensial Exercise 2: Tinjau hal-hal penting Exercise 3: Latihan dasar-dasar Exercise 4: Mengubah hasil Anda Exercise 5: Transformasi numerik & string

Latihan Saat Ini

Exercise 6: Ekstrak yang Anda perlukan Exercise 7: Bekerja dengan fungsi agregat Exercise 8: Mengagregasi keuangan Exercise 9: Mengagregasi string Exercise 10: Tabel yang mana?

How do you find the data you need in your database in order to answer real-world business questions? Here you will learn how to use system tables to explore your database. You will use these tables to create a new tool that contains a list of all tables and columns in your database. Finally, you will create an Entity Relationship Diagram (ERD) which will help you connect multiple tables.

Exercise 1: Find the right table Exercise 2: LIMITing your search Exercise 3: Which table to use?Exercise 4: What tables are in your database?Exercise 5: Determine the monthly income Exercise 6: Join the correct tables Exercise 7: What columns are in your database?Exercise 8: A VIEW of all your columns Exercise 9: Testing out your new VIEW Exercise 10: The average length of films by category Exercise 11: Complex joins Exercise 12: Build the entity relationship diagram Exercise 13: Which films are most frequently rented?

Working with SQL to solve real-world problems will oftentimes require you to do more than retrieve the data you need, oftentimes you will need to manage the data in your database. This includes creating data, updating it and, when necessary, deleting it.

Exercise 1: Store your data Exercise 2: Storing new data Exercise 3: Using existing data Exercise 4: TABLE vs VIEW Exercise 5: Update your data Exercise 6: What should you modify?Exercise 7: Update the price of rentals Exercise 8: Updated based on other tables Exercise 9: Delete your data Exercise 10: Deleting all table data Exercise 11: Delete selected records Exercise 12: A family friendly video store

How do you ensure that the SQL scripts you write will be easy to understand for anyone who needs to read them? This chapter will cover approaches you can leverage to ensure that your code clearly conveys your intent, is readable by others and follows best practices.

Exercise 1: Convey your intent Exercise 2: How to convey our intent Exercise 3: Clarify the intent of this query Exercise 4: Fix this query - intent Exercise 5: Write readable code Exercise 6: How to make code easier to read Exercise 7: Make this query easier to read - Part I Exercise 8: Make this query easier to read - Part II Exercise 9: Avoid common mistakes Exercise 10: What are the don'ts of writing SQL code?Exercise 11: Apply best practices to your code Exercise 12: Recap