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Course Description
Explore the Role of SQL in Relational Database Management
There are a lot of reasons why SQL is the go-to query language for relational database management. The main one is that SQL is a powerful language that can handle large amounts of data in complex ways and solve tricky analytical questions. In this course, you will gain an introduction to relational databases in SQL.Learn how to create tables and specify their relationships, as well as how to enforce data integrity. Additionally, discover other unique features of database systems, such as constraints.
Create Your First Database
You begin the course by creating your first database with simple SQL commands. Next, you’ll learn how to update your database as the structure changes by migrating data and deleting tables.In the final chapter, you will glue tables in foreign keys together and establish relationships that greatly benefit your data quality. Finally, you will run ad hoc analyses on your new database.
Understand the Basics of Relational Databases
By the end of the course, you will gain a basic yet essential understanding of SQL relational databases. They are widely used in various data science fields (from healthcare to finance) and have consequently become one of the crucial languages for data scientists. If you're interested in deepening your knowledge further, you may be interested in our SQL for Database Administrators, SQL Server Developer, and SQL Server for Database Administrators Tracks.Feels like what you want to learn?
Start Course for FreeWhat you'll learn
- Define PostgreSQL data types, NOT NULL, and UNIQUE attribute constraints for column-level consistency enforcement
- Differentiate 1:N and N:M relationships and implement them with foreign keys and junction tables
- Evaluate and use referential integrity actions (NO ACTION, CASCADE, SET NULL, SET DEFAULT) for consistency preservation during data modifications
- Identify advantages of relational databases over flat file storage regarding redundancy reduction and data quality preservation
- Select and apply primary, surrogate, and candidate keys for unique record identification
Prerequisites
Curriculum
Course outline
1
Your first database
In this chapter, you'll create your very first database with a set of simple SQL commands. Next, you'll migrate data from existing flat tables into that database. You'll also learn how meta-information about a database can be queried.
- Introduction to relational databases50 XP
- Attributes of relational databases50 XP
- Query information_schema with SELECT100 XP
- Tables: At the core of every database50 XP
- CREATE your first few TABLEs100 XP
- ADD a COLUMN with ALTER TABLE100 XP
- Update your database as the structure changes50 XP
- RENAME and DROP COLUMNs in affiliations100 XP
- Migrate data with INSERT INTO SELECT DISTINCT100 XP
- Delete tables with DROP TABLE100 XP
2
Enforce data consistency with attribute constraints
After building a simple database, it's now time to make use of the features. You'll specify data types in columns, enforce column uniqueness, and disallow NULL values in this chapter.
3
Uniquely identify records with key constraints
Now let’s get into the best practices of database engineering. It's time to add primary and foreign keys to the tables. These are two of the most important concepts in databases, and are the building blocks you’ll use to establish relationships between tables.
4
Glue together tables with foreign keys
In the final chapter, you'll leverage foreign keys to connect tables and establish relationships that will greatly benefit your data quality. And you'll run ad hoc analyses on your new database.
S
Introduction to Relational Databases in SQL
Course
Complete
