Learn SQL and start working with data confidently. This course covers everything from basic queries to joins, filters, and database management - giving you one of the most in-demand skills across tech, business, and analytics.
Earn a recognized certificate - exam included, ready to add to your LinkedIn and resume
Query real databases - master the language behind every data-driven business
No experience required - structured for complete beginners
Learn at your own pace - self-paced with no deadlines
Hero plan included - get one year of premium access to ad-free learning, challenges, practice tests, and much more
Become a Certified SQL Developer with W3Schools.
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Complete the exam at your own pace. The exams have no expiration date.
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Overview of the Training Modules
Topic
Description
SQL Introduction
Learn the basics of SQL
SQL Syntax
Understand SQL syntax rules
SQL SELECT
Retrieve data from a database
SQL SELECT DISTINCT
Select unique values
SQL WHERE
Filter results with conditions
SQL ORDER BY
Sort query results
SQL AND, OR, NOT
Combine conditions
SQL INSERT INTO
Insert new records
SQL NULL Values
Handle NULL values
SQL UPDATE
Modify existing records
SQL DELETE
Remove records
SQL SELECT TOP
Select top records
Aggregate Functions
Perform calculations on data
SQL MIN and MAX
Find minimum and maximum values
SQL COUNT, AVG, SUM
Aggregate numeric data
SQL LIKE
Match patterns in data
SQL Wildcards
Use wildcards for pattern matching
SQL IN
Match values in a list
SQL BETWEEN
Select values within a range
SQL Aliases
Use aliases for tables and columns
SQL Joins
Combine data from multiple tables
SQL INNER JOIN
Return matching records from both tables
SQL LEFT JOIN
Return all records from the left table
SQL RIGHT JOIN
Return all records from the right table
SQL FULL JOIN
Return all records when there is a match
SQL Self Join
Join a table with itself
SQL UNION
Combine multiple query results
SQL GROUP BY
Group data by columns
SQL HAVING
Filter groups of data
SQL EXISTS
Check for the existence of records
SQL ANY and ALL
Compare multiple values
SQL SELECT INTO
Copy data into a new table
SQL INSERT INTO SELECT
Copy data from one table to another
SQL CASE
Use conditional logic in queries
SQL NULL Functions
Handle NULL values effectively
SQL Stored Procedures
Use stored procedures for automation
SQL Comments
Add comments in SQL
SQL Operators
Use operators in SQL
SQL Database
Understand database concepts
SQL Drop DB
Delete a database
SQL Backup DB
Backup and restore databases
SQL CREATE TABLE
Create new tables
SQL Drop Table
Delete existing tables
SQL Alter Table
Modify table structures
SQL Constraints
Define rules for table data
SQL Unique
Ensure unique values
SQL Primary Key
Define a unique identifier
SQL CHECK Constraint
Enforce specific column rules
SQL Default Constraint
Set default values
SQL Create Index Statement
Speed up queries with indexes
SQL Auto Increment
Auto-generate values
SQL Dates
Work with date and time
SQL Views
Create virtual tables
SQL Injections
Prevent SQL injection attacks
SQL Hosting
Host SQL databases online
SQL Data Types
Different data types in SQL
Get Your Certificate
W3Schools has been a leading authority in web development education for over 20 years, providing comprehensive resources and training for developers worldwide. This recognition and credibility within the industry make our certifications in demand.
Course overview
Course fee:
$76
Course level:
Beginner
Time to complete:
48 hours
Course Format:
Self paced
Language:
English
Prerequisites:
None
Exam and Certification:
Included
Number of certificates:
1
Certificate name:
Certified SQL Developer
Exam format:
Multiple choice
Certification skill level:
Intermediate (40%), Advanced (75%) and Professional (90%)
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Looking forward to adapting and adopting what I have learned to be flexible and ready for any on-the-job tasks. Thank you for this opportunity to continue to learn and grow.
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A great Python certification. The questions are relevant, practical, and cover real Python concepts. I passed with 96% and would definitely recommend it.
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W3 school has a systematic aproach to study a topic. Having received a Certification of completion in SQL, I've made myself stand out of my colleagues at work (non-IT field).
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The "Learn NumPy" course is excellent. The exercises are very useful and helped to gain understanding of the subject. All the topics have been explained very nicely and in a lucid manner. I learned about array creation, data types, indexing, and slicing. NumPy arrays are multidimensional. NumPy stands for Numerical Python and was created in 2005 by the respected Sir Travis Oliphant. NumPy is very interesting and challenging. Revision is needed to retain the concepts and the syntax. Sound knowledge of NumPy will help an aspiring data scientist to succeed in his career. I also learned about copy and view, shape, reshape, iterating, split, sort, and filter. Learned about the functions nditer() and ndenumerate() used in iteration. The topics on random numbers included random number generation of types integer and float and continuous and discrete probability distributions like Normal, Binomial, and Poisson. Probability density functions also included Uniform, Multinomial, Rayleigh, and Zipf. Some of the topics covered in Ufuncs are add, subtract, multiply, divide, divmod, sum, prod, cumsum, LCM, GCD, and Set Operations. ufuncs stands for "Universal Functions," and it performs the element-wise mathematical operations. Thanks.
What is the difference between a course and a certificate?
When you complete the course requirements, including the final exam, you will get a certification of completion. Getting a certificate proves your commitment to improving your skills.
Tip: If you are confident in your skills already and have followed the free tutorials you can also enrol directly to complete the final exam for the same certification here: https://campus.w3schools.com/collections/certifications
Our certificates are not meant to replace formal higher education but provide a cheaper, convenient way of documenting your skills. We cannot guarantee that the certifications will get you a job. We would recommend that you work on a portfolio showcasing your skills that you can present during interviews. Your portfolio, in addition to certificates, will help any employer to judge your skills and commitment.
How long time does it take to access the exam?
There is no waiting time. Immediately after completing your purchase you are sent an email link which gives you instant access to the exam.
What are the certificate levels?
There are three different levels: intermediate, advanced and professional.
Intermediate is 40%, Advanced is 75%, and Professional is 90%.
How many exam attempts do I have?
You have 3 attempts per exam. You can choose when to take each attempt. If you don't pass, you can study and take it again at your convenience.
Can I take the exam online?
All our exams are taken online with multiple choice questions. You do not need to be physically present.
How long does the certificate last?
The certificate never expires. You don't need to renew it.
How can I verify the authenticity of my certificate from W3Schools?
The certificate will be issued in your name, and its authenticity can be verified through W3Schools by using the unique link or QR code provided with it.
Do you offer payment plans?
Yes, W3Schools offers payment plans to make our paid courses, exams and certificates more affordable. You can choose between a 3-month or 6-month payment plan to spread the cost of your course over several months. This allows you to manage your finances more easily.
