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.

SQL Esensial

Tinjau hal-hal penting

Latihan dasar-dasar

Mengubah hasil Anda

Transformasi numerik & string

Ekstrak yang Anda perlukan

Bekerja dengan fungsi agregat

Mengagregasi keuangan

Mengagregasi string

Tabel yang mana?

Use Real-World SQL

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.

Find the right table

LIMITing your search

Which table to use?

What tables are in your database?

Determine the monthly income

Join the correct tables

What columns are in your database?

A VIEW of all your columns

Testing out your new VIEW

The average length of films by category

Complex joins

Build the entity relationship diagram

Which films are most frequently rented?

Find Your Data

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.

Store your data

Storing new data

Using existing data

TABLE vs VIEW

Update your data

What should you modify?

Update the price of rentals

Updated based on other tables

Delete your data

Deleting all table data

Delete selected records

A family friendly video store

Manage Your Data

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.

Convey your intent

How to convey our intent

Clarify the intent of this query

Fix this query - intent

Write readable code

How to make code easier to read

Make this query easier to read - Part I

Make this query easier to read - Part II

Avoid common mistakes

What are the don'ts of writing SQL code?

Apply best practices to your code

Recap

Best Practices for Writing SQL

DVD Rental Database

Kini setelah Anda mempelajari alat dasar SQL, Anda siap menyusunnya menjadi keterampilan praktis untuk dunia nyata. Dalam kursus ini, Anda akan bekerja dengan basis data dari perusahaan penyewaan film fiktif. Ukuran dan kompleksitas basis data ini memungkinkan Anda merasakan langsung tantangan dalam bekerja dengan basis data. Sepanjang kursus, Anda akan menggunakan SQL untuk menjawab pertanyaan bisnis. Anda akan mempelajari keterampilan baru yang membantu Anda menemukan tabel yang Anda perlukan. Selanjutnya, Anda akan mempelajari cara menyimpan dan mengelola data ini dalam tabel dan view yang Anda buat. Yang terbaik, Anda juga akan belajar menulis kode yang tidak hanya jelas menyampaikan maksud Anda, tetapi juga mudah dibaca.

Data Manipulation in SQL

Temukan tabel, simpan dan kelola tabel dan tampilan baru, serta tulis kode SQL untuk menjawab pertanyaan bisnis.

Menerapkan SQL pada Masalah Dunia Nyata

Temukan tabel, simpan, dan kelola tabel dan tampilan baru, serta tulis kode SQL yang mudah dipelihara untuk menjawab pertanyaan bisnis.

SQL untuk Analis Bisnis

Tinjau hal-hal penting

Menerapkan SQL pada Masalah Dunia Nyata

Latihan interaktif praktis