Learn SQL

This course covers intermediate SQL concepts like SQL queries, SELECT query, SQL WHERE, SQL DISTINCT, SQL GROUP BY, SQL ORDER BY, SQL aggregate functions, SQL joins, and SQL subqueries.

Intermediate

28 Lessons

2h 30min

Certificate of Completion

This course covers intermediate SQL concepts like SQL queries, SELECT query, SQL WHERE, SQL DISTINCT, SQL GROUP BY, SQL ORDER BY, SQL aggregate functions, SQL joins, and SQL subqueries.

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This course includes

90 Playgrounds

23 Quizzes

Course Overview

What You'll Learn

Course Content

Recommendations

Course Overview

In this course, you will explore Structured Query Language (SQL), mastering its core concepts through hands-on projects. You’ll start with fundamental SQL queries like SELECT query, SQL WHERE, etc. and gradually progress to using SQL DISTINCT, SQL GROUP BY, SQL ORDER BY, and SQL aggregate functions. You'll learn how to create and manage tables, compute new fields, and optimize data relationships using foreign keys. By the end, you will be adept at using SQL joins, SQL subqueries, and merging techniques ...Show More

TAKEAWAY SKILLS

Sql

Database

Programming Language

Learn To Code

What You'll Learn

An understanding of the declarative nature of SQL and its core principles

The ability to formulate SQL queries using SELECT query, SQL WHERE, and SQL DISTINCT

Hands-on experience building queries with SQL GROUP BY, SQL ORDER BY, and SQL aggregate functions to uncover crucial information

The ability to create, update, and delete data within tables

The ability to extract and manipulate data across multiple tables using SQL joins and SQL subqueries

An understanding of the declarative nature of SQL and its core principles

Course Content

Introduction to SQL

2 Lessons

In this chapter, you’ll learn SQL queries and the SELECT query in an introduction to SQL, and how to interact with a relational database.

Embark on an SQL Adventure!

Unveiling SQL

SQL SELECT

2 Lessons

In this chapter, you’ll master SQL SELECT and SQL DISTINCT to eliminate duplicates, ensuring you retrieve accurate and unique data from your database.

Selecting Display Fields and Specifying the Data Source

Fetching Unique Results

SQL Queries: SELECT, WHERE, AND, OR, NOT, and Strings

3 Lessons

In this chapter, learn to filter data using SQL SELECT WHERE, handle SQL Strings, and combine conditions with SQL AND, SQL OR, SQL NOT for query results.

Specifying the Filter Criteria

Working with the String Data Type

Logical Operators and Compound Conditions

SQL ORDER BY, Aggregate functions, and GROUP BY

3 Lessons

In this chapter, learn data sorting with SQL ORDER BY, perform calculations using SQL aggregate functions, and organize query results with SQL GROUP BY.

Sorting Data

Data Aggregation and Grouping

Putting It All Together

SQL CREATE, DESCRIBE, INSERT INTO, UPDATE and DELETE Tables

3 Lessons

In this chapter, create tables with SQL CREATE TABLE, add data using SQL INSERT INTO, modify records with SQL UPDATE, and remove them using SQL DELETE.

Creating Tables

Adding New Data to the Database

Modifying Data

SQL Alter Table and Aliases

5 Lessons

In this chapter, modify database structures using SQL ALTER TABLE and simplify query readability with SQL aliases for table and column names.

Navigating Change

Changing the Structure of a Table

Adding New Fields in a Table

Performing Calculations and Aliasing

Managing Computed Attributes

Data Redundancy

4 Lessons

In this chapter, minimize data redundancy by using SQL foreign keys to establish relationships between tables to ensure data integrity and management.

Data Redundancy

Dealing with Redundancy

Some Pitfalls

Foreign Keys and Database Relationships

SQL Joins and Subqueries

5 Lessons

In this chapter, learn SQL joins and subqueries to retrieve related data, while understanding the implications of the SQL cartesian product in queries.

Merging Data from Multiple Tables

The JOIN Clause

Using JOIN to Retrieve Information from More than Two Tables

Using JOIN to Generate Our Reports

Subqueries

Wrap Up

1 Lessons

Conclusion

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Frequently Asked Questions

How to learn SQL?

Here are the steps to start learning SQL: Begin with basic SQL commands (SELECT, INSERT, UPDATE). Learn to filter and sort data using WHERE and ORDER BY. Study JOINs to combine tables. Practice with aggregate functions (COUNT, AVG, SUM). Use online SQL platforms (e.g., SQLBolt, LeetCode) for hands-on practice.

How long does it take to learn SQL?

Learning SQL basics can take 1–2 weeks with consistent practice. To become proficient enough for practical applications, expect 1–3 months, depending on prior experience.

Is SQL hard to learn?

SQL is generally considered easy to learn, especially for beginners, because its syntax is straightforward and similar to natural language. With regular practice, most people find it manageable.

How to learn SQL fast?

To learn SQL quickly: Focus on essential commands (SELECT, JOIN, WHERE). Use interactive online tutorials to practice immediately. Work on sample databases to understand data relations. Set up a small project to apply what you learn practically.

Can I teach myself SQL?

Yes, SQL is self-teachable with the help of online resources, tutorials, and practice platforms. Many people successfully learn SQL independently and apply it in real-world projects.

Is SQL easy than Python?

For most beginners, SQL is easier than Python because of its simpler syntax and specific use cases for database queries. Python covers broader programming concepts, which can be more complex for new learners.