SQL & Databases

SQL & Databases Courses

Master SQL and databases: from basic queries to advanced techniques, schema design, and Python integration — become proficient in working with data!

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Gained skills:

A/B Test Analysis in SQLAI Lead ScoringAI Outreach AutomationAI Proposal DraftingAI Sales Objection HandlingAI Sales Pipeline MappingAI-Powered Prospect ResearchAND/OR/NOT OperatorsAdvanced Join TechniquesAdvanced SQL QueryingAdvanced SQL ReportingAggregations and GroupingAttribution ModelingBusiness Logic with CASE WHENCASE WHEN SyntaxCRUD OperationsCampaign Performance QueryingCharacter Data TypesCohort Analysis with SQLComplex Query ConstructionCorrelated SubqueriesData Analysis with JoinsData Analysis with SQLData Categorization in SQLData Filtering and SortingData Indexing and Selection in pandasData Manipulation (DML)Data Modeling for BIData Reconciliation in SQLData Type Selection Best PracticesDatabase ManagementDatabase ModelingDatabase NormalizationDatabase Pattern RecognitionDate and Time Data TypesDistinct Value SelectionEXPLAIN Statement MasteryEntity-Relationship ModelingEvent-based Data ModelingExecution Plan AnalysisExecution Plan InterpretationFeature Adoption AnalysisFunnel Analysis in SQLGrouping and Filtering DataIndex UtilizationLedger-Style SQL JoinsMulti-table QueriesNULL Value HandlingNested SQL SubqueriesNumeric Data TypesORDER BY SortingPartitioning and Framing in SQLPython ProgrammingQuery OptimizationQuery Planning and OptimizationRange-Based FilteringRanking and Analytic FunctionsReferential IntegrityRelational Database DesignResult Set ConstructionRetention and Churn QueriesSQL Aggregate FunctionsSQL AggregationsSQL BasicsSQL Conditional LogicSQL Data Types FundamentalsSQL Date and Time FunctionsSQL FunctionsSQL JOIN TypesSQL JSON FunctionsSQL JoinsSQL Logical FunctionsSQL Null FunctionsSQL Numeric FunctionsSQL Parsing and ValidationSQL Period-over-Period AnalysisSQL Query AnalysisSQL Query LifecycleSQL Query OptimizationSQL Reporting PatternsSQL SELECT StatementsSQL String FunctionsSQL SubqueriesSQL Time-Series AggregationSQL Transaction Logic & ACIDSQL UNION QueriesSQL Window FunctionsSQL in Python ProjectsSchema Definition (DDL)Sessionized Data AnalysisSpecial and Advanced Data TypesSubqueriesTable JoinsWHERE Clause FilteringWindow FunctionsWindow Functions for Product Metrics

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Courses

Browse SQL & Databases courses and projects

Level

Type of lesson

Technologies

Introduction to SQL

4 hours

41 chapters

Beginner

Acquired skills: SQL SELECT Statements, WHERE Clause Filtering, ORDER BY Sorting, SQL Aggregate Functions, AND/OR/NOT Operators, NULL Value Handling, Range-Based Filtering, Distinct Value Selection

Intermediate SQL

3 hours

25 chapters

Intermediate

Acquired skills: SQL Aggregate Functions, Grouping and Filtering Data, Nested SQL Subqueries, SQL UNION Queries, SQL JOIN Types, Data Manipulation (DML), Schema Definition (DDL), Complex Query Construction

SQL Optimization and Query Features

4 hours

22 chapters

Advanced

Acquired skills: SQL Query Optimization, Data Indexing and Selection in pandas, Database Management, Database Normalization, SQL Basics, CRUD Operations, Database Modeling

SQL for Data Analysis

2 hours

18 chapters

Intermediate

Acquired skills: SQL Basics, Data Filtering and Sorting, Aggregations and Grouping, Table Joins, Subqueries, SQL Functions, Data Analysis with SQL

Working with Databases in Python

3 hours

21 chapters

Intermediate

Acquired skills: Python Programming, CRUD Operations, SQL in Python Projects, Database Normalization, SQL Basics

Mastering CASE WHEN in SQL

3 hours

24 chapters

Intermediate

Acquired skills: SQL Conditional Logic, CASE WHEN Syntax, Data Categorization in SQL, Advanced SQL Querying

Subqueries in SQL

2 hours

18 chapters

Beginner

Acquired skills: SQL Subqueries, Correlated Subqueries, Data Analysis with SQL, Advanced SQL Querying

Window Functions in SQL

4 hours

21 chapters

Advanced

Acquired skills: SQL Window Functions, Ranking and Analytic Functions, Partitioning and Framing in SQL, Advanced SQL Reporting

Relational Database and Normalization

1 hour

12 chapters

Beginner

Acquired skills: SQL Query Optimization, Database Normalization

AI Sales Pipeline Builder

1 hour

16 chapters

Beginner

Acquired skills: AI Sales Pipeline Mapping, AI Lead Scoring, AI-Powered Prospect Research, AI Outreach Automation, AI Sales Objection Handling, AI Proposal Drafting

Database Design Patterns

2 hours

18 chapters

Beginner

Acquired skills: Relational Database Design, Database Normalization, Entity-Relationship Modeling, Referential Integrity, Database Pattern Recognition

Functions in SQL

3 hours

35 chapters

Beginner

Acquired skills: SQL String Functions, SQL Date and Time Functions, SQL Numeric Functions, SQL Logical Functions, SQL Null Functions, SQL JSON Functions

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Codefinity

Video-based learning platforms

Video content

Downloadable materials

Esteemed certificates

Interactive learning environment

Error correction

AI assistant

Access to all content with one subscription

Career opportunitiesLearn about the most popular professions, average salaries, and companies actively seeking specialists in this field.

Database Administrator

Data Engineer

Data Architect

$81k

$110k

$140k

Min

Average

Max

Annual salary

(Average in the US)

Hiring companies

*Source: Glassdoor

Chosen by students of top schools

Including 30 out of top-30 U.S. colleges

SQL & Databases Courses: Key Info and Questions

What is SQL and why is it important?

SQL (Structured Query Language) is the standard language for interacting with relational databases. It allows you to retrieve, filter, update, and manage data efficiently — making it a core skill for data analysts, developers, and anyone working with structured data.

What will I learn in SQL & Databases courses?

You’ll learn how to write SQL queries, use SELECT, WHERE, JOIN, GROUP BY, ORDER BY, and perform operations like filtering, aggregating, and combining data. Advanced topics include subqueries, window functions, indexing, and database design.

Do I need coding experience to start learning SQL?

Not at all. SQL has a relatively simple, readable syntax and is perfect for beginners. Even without programming experience, you can quickly start querying real databases and exploring structured data.

Are the courses practical and hands-on?

Yes — courses include interactive SQL editors, real-world datasets (like sales, users, or orders), and exercises that simulate real analysis tasks. You’ll write queries and get instant feedback, making learning active and engaging.

What databases will I work with?

Most courses use SQLite or PostgreSQL for simplicity, but you’ll also get exposed to MySQL and possibly cloud databases. The SQL you learn is transferable across all major relational database systems.

What careers can SQL help me with?

SQL is a must-have for roles like data analyst, business analyst, backend developer, database administrator, and product analyst. It’s also widely used in marketing, operations, finance, and research roles that involve data-driven decisions.

How is SQL used in real life?

SQL is used to power dashboards, generate reports, connect APIs to databases, track user behavior, and run backend services. It’s the foundation behind most apps, websites, and data tools used in modern businesses.

Will I get a certificate?

Yes — completing any SQL & Databases course earns you a certificate that proves your skills in querying and managing data, which can enhance your job applications or technical portfolio.

Can I combine SQL with other tools like Python or Excel?

Definitely. Many data analysts use SQL to get the data, and then tools like Python, Excel, or BI platforms (like Tableau) to further analyze and visualize it. Our advanced courses may show you how to connect them together.