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The Complete SQL Tutorial - 62 Lessons From Basics to Advanced - Tutorsbot

The Complete SQL Tutorial

62 articles · 12 chapters

What Is a Relational Database and Why Does It Matter?
How Do You Set Up a Practice Database Locally?
How Do You Run Your First SELECT Statement?
How Do You Choose Columns and Rename Output?

How Does WHERE Filter Rows Precisely?
How Do AND, OR and NOT Combine Conditions?
What Do IN, BETWEEN and LIKE Match?
How Do NULLs Behave in Comparisons and Filters?
What Do DISTINCT, LIMIT and TOP Control?

How Does ORDER BY Sort Multi-Level Results?
How Do Expressions and CASE Transform Columns?
Which String Functions Format Text?
How Do You Clean Messy Text Data With SQL?
What Do Number and Date Functions Compute?
How Do CAST and COALESCE Fix Messy Data?

What Do COUNT, SUM and AVG Summarize?
How Does GROUP BY Collapse Rows Into Summaries?
When Does HAVING Filter What WHERE Cannot?
How Do Multi-Column Groups Answer Layered Questions?
Which Aggregation Recipes Solve Reporting Tasks?

Why Do Relational Databases Split Data Across Tables?
How Does an INNER JOIN Match Rows?
What Do LEFT and RIGHT Joins Preserve?
When Are FULL OUTER and CROSS Joins Right?
What Is a Self Join and When Do You Need One?
How Do You Chain Joins Across Many Tables?

How Do Subqueries Inside WHERE Compare Sets?
What Do Subqueries in FROM Buy You?
How Do Correlated Subqueries Reference Outer Rows?
How Do CTEs Make Complex Queries Readable?
What Do Recursive CTEs Traverse?

How Does INSERT Add Rows Correctly?
How Does UPDATE Change Rows Without Collateral Damage?
What Is the Difference Between DELETE and TRUNCATE?
How Do Upserts Insert or Update in One Step?
What Do Transactions Guarantee With BEGIN and COMMIT?
How Do Savepoints and ROLLBACK Undo Part of a Transaction?

How Does CREATE TABLE Choose the Right Types?
VARCHAR vs TEXT vs INT vs DATE: Which Type Fits?
What Makes a Good Primary Key?
How Do Foreign Keys Model Relationships?
How Does Normalization Remove Duplication?
How Do You Design a Schema From a Real Requirement?

What Do NOT NULL, UNIQUE and DEFAULT Enforce?
How Do CHECK Constraints Catch Bad Data Early?
How Do Auto-Increment and Sequences Generate IDs?
How Does ALTER TABLE Evolve a Schema?
What Do ON DELETE and ON UPDATE Actions Do?

What Are Views and When Do They Earn Their Keep?
How Do Indexes Speed Reads and Slow Writes?
How Does EXPLAIN Reveal a Query's Plan?
Which Columns Deserve an Index?
Which Fixes Rescue the Most Common Slow Queries?

What Do Window Functions Add to Aggregates?
How Do RANK, DENSE_RANK and ROW_NUMBER Differ?
How Do Frames Compute Running Totals and Moving Averages?
How Do LAG and LEAD Compare Rows to Previous or Next?
How Do You Reshape Rows Into Report Columns?

How Do You Answer a Multi-Table Business Question End to End?
What Query Conventions Keep Team SQL Maintainable?
What Differs Between MySQL, PostgreSQL and SQL Server?
What Goes Into a Complete Sales Analytics Project?

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Home/Tutorials/The Complete SQL Tutorial

The Complete SQL Tutorial

Learn SQL step by step from your first SELECT to window functions, transactions, indexes and a complete sales-analytics capstone, with runnable examples tested on real databases.

12 modules62 lessons~7 hrs of reading100% Free

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Course outline

1.SQL Basics and Databases4 lessons
2.SQL SELECT Queries5 lessons
3.Sorting, Functions and Shaping6 lessons
4.SQL GROUP BY and Aggregate Functions5 lessons
5.Joining Tables6 lessons
6.Subqueries and CTEs5 lessons
7.

Modifying Data

6 lessons

8.Table Design and Schema6 lessons

9.Constraints and Integrity5 lessons

10.Views, Indexes and Performance5 lessons

11.Window Functions5 lessons

12.SQL Projects for Practice4 lessons

1.SQL Basics and Databases

1.1What Is a Relational Database and Why Does It Matter?
1.2How Do You Set Up a Practice Database Locally?
1.3How Do You Run Your First SELECT Statement?
1.4How Do You Choose Columns and Rename Output?

2.SQL SELECT Queries

2.1How Does WHERE Filter Rows Precisely?
2.2How Do AND, OR and NOT Combine Conditions?
2.3What Do IN, BETWEEN and LIKE Match?
2.4How Do NULLs Behave in Comparisons and Filters?
2.5What Do DISTINCT, LIMIT and TOP Control?

3.Sorting, Functions and Shaping

3.1How Does ORDER BY Sort Multi-Level Results?
3.2How Do Expressions and CASE Transform Columns?
3.3Which String Functions Format Text?
3.4How Do You Clean Messy Text Data With SQL?
3.5What Do Number and Date Functions Compute?
3.6How Do CAST and COALESCE Fix Messy Data?

4.SQL GROUP BY and Aggregate Functions

4.1What Do COUNT, SUM and AVG Summarize?
4.2How Does GROUP BY Collapse Rows Into Summaries?
4.3When Does HAVING Filter What WHERE Cannot?
4.4How Do Multi-Column Groups Answer Layered Questions?
4.5Which Aggregation Recipes Solve Reporting Tasks?

5.Joining Tables

5.1Why Do Relational Databases Split Data Across Tables?
5.2How Does an INNER JOIN Match Rows?
5.3What Do LEFT and RIGHT Joins Preserve?
5.4When Are FULL OUTER and CROSS Joins Right?
5.5What Is a Self Join and When Do You Need One?
5.6How Do You Chain Joins Across Many Tables?

6.Subqueries and CTEs

6.1How Do Subqueries Inside WHERE Compare Sets?
6.2What Do Subqueries in FROM Buy You?
6.3How Do Correlated Subqueries Reference Outer Rows?
6.4How Do CTEs Make Complex Queries Readable?
6.5What Do Recursive CTEs Traverse?

7.Modifying Data

7.1How Does INSERT Add Rows Correctly?
7.2How Does UPDATE Change Rows Without Collateral Damage?
7.3What Is the Difference Between DELETE and TRUNCATE?
7.4How Do Upserts Insert or Update in One Step?
7.5What Do Transactions Guarantee With BEGIN and COMMIT?
7.6How Do Savepoints and ROLLBACK Undo Part of a Transaction?

8.Table Design and Schema

8.1How Does CREATE TABLE Choose the Right Types?
8.2VARCHAR vs TEXT vs INT vs DATE: Which Type Fits?
8.3What Makes a Good Primary Key?
8.4How Do Foreign Keys Model Relationships?
8.5How Does Normalization Remove Duplication?
8.6How Do You Design a Schema From a Real Requirement?

9.Constraints and Integrity

9.1What Do NOT NULL, UNIQUE and DEFAULT Enforce?
9.2How Do CHECK Constraints Catch Bad Data Early?
9.3How Do Auto-Increment and Sequences Generate IDs?
9.4How Does ALTER TABLE Evolve a Schema?
9.5What Do ON DELETE and ON UPDATE Actions Do?

10.Views, Indexes and Performance

10.1What Are Views and When Do They Earn Their Keep?
10.2How Do Indexes Speed Reads and Slow Writes?
10.3How Does EXPLAIN Reveal a Query's Plan?
10.4Which Columns Deserve an Index?
10.5Which Fixes Rescue the Most Common Slow Queries?

11.Window Functions

11.1What Do Window Functions Add to Aggregates?
11.2How Do RANK, DENSE_RANK and ROW_NUMBER Differ?
11.3How Do Frames Compute Running Totals and Moving Averages?
11.4How Do LAG and LEAD Compare Rows to Previous or Next?
11.5How Do You Reshape Rows Into Report Columns?

12.SQL Projects for Practice

12.1How Do You Answer a Multi-Table Business Question End to End?
12.2What Query Conventions Keep Team SQL Maintainable?
12.3What Differs Between MySQL, PostgreSQL and SQL Server?
12.4What Goes Into a Complete Sales Analytics Project?

Start with lesson 1.1

What Is a Relational Database and Why Does It Matter?