SQL & Databases 1-on-1: MySQL, PostgreSQL, SQL Server, Oracle, SQLite

From 38 C$ /h

Learn SQL by writing real queries, not by memorizing theory.

I'm a working software engineer with a bachelor's degree in informatics, and I use SQL and relational databases in practice. I teach it step by step, with hands-on examples, so you understand what each query is doing and why.

I work with all major database systems: MySQL, PostgreSQL, Microsoft SQL Server, Oracle Database and SQLite. Whichever one your course, job or project uses, we can learn on that one and I'll point out the differences in syntax between them.

What we can cover:
- SELECT basics: filtering, sorting, grouping and aggregate functions
- JOINs (inner, left, right) and subqueries, explained visually
- Creating and modifying tables, keys, relationships and constraints
- Database design and normalization
- Indexes and writing queries that run faster
- Help with university or school assignments, exam preparation and practice tasks
- Preparing for a job interview or a first project that needs SQL

Lessons are 45 minutes long and adapted to your level. Complete beginners are very welcome, and if you already know the basics, we can go straight to the topics you find difficult. We work on example databases, or on your own assignment if you have one.

Lessons are available online, or in person in Zagreb. They can be held in English or Croatian.

Location

Online from Croatia

About Me

Hi, I'm Filip, a software engineer based in Zagreb, Croatia. I work in software development every day, and I also love teaching. Tutoring is something I have been doing since high school, when I helped my classmates with math and Italian.

I teach programming (Java, JavaScript, TypeScript, C++, C#, HTML/CSS and SQL), mathematics for primary and secondary school students, and English and Italian for beginners and intermediate learners. I spent a school year in Italy as an exchange student, so I know what it's like to learn a language by actually living in it.

As a teacher, I'm patient and practical. I care more about you understanding why something works than about memorizing it, so we solve real problems together, step by step, and you gradually take over. I'm happiest working with students who are curious, even if they feel stuck or "bad" at the subject right now. Mistakes are a normal part of learning, and I'll never make you feel bad about them.

Lessons are 45 minutes long and adapted to your level and goals. We can meet online or in person in Zagreb, and I can teach in English or Croatian. Send me a message and tell me what you'd like to work on!

Education

Bachelor's degree (Bachelor of Informatics), Faculty of organization and informatics, 2026

Experience / Qualifications

- Working as a professional software engineer for 3+ years
- Tutoring in mathematics, Italian and other school subjects since high school
- School year abroad in Italy as an exchange student (daily life and schooling in Italian)
- Experience with Java, JavaScript, TypeScript, C++, C#, HTML/CSS and SQL (MySQL, PostgreSQL, SQL Server, Oracle, SQLite)

Age

Children (7-12 years old)

Teenagers (13-17 years old)

Adults (18-64 years old)

Seniors (65+ years old)

Student level

Beginner

Intermediate

Duration

45 minutes

The class is taught in

English

Italian

Skills

Sql

Database

Software engineering

Availability of a typical week

(GMT -04:00)

New York

Online via webcam

Mon

Tue

Wed

Thu

Fri

Sat

Sun

00-04

04-08

08-12

12-16

16-20

20-24

Italian for Beginners & Intermediate: Speak Italian with Confidence (1-on-1)

38 C$ /h

Learn Italian in a relaxed, practical way, with lessons built around what you actually need.

I spent a full school year in Italy as an exchange student, attending school and living day to day in Italian. That's where I learned the language the way it's really spoken, and I've since helped classmates with Italian as well. I know which parts of the language usually trip learners up and how to explain them simply.

What we can work on:
- Speaking and everyday conversation (travel, daily life, meeting people)
- Basic grammar, explained step by step with plenty of examples
- Vocabulary and pronunciation
- Help with school assignments and homework
- Preparing for a trip, an exchange or a move to Italy

Lessons are 45 minutes long and adapted to your level and goals, whether you are starting from zero or want to get more fluent. Mistakes are completely normal in my lessons, we learn from them together.

Lessons are available online, or in person in Zagreb. They can be held in English or Croatian.

Mathematics 1-on-1: Primary, Secondary & High School (All Levels)

38 C$ /h

Math doesn't have to be scary. With the right explanation, most students find it makes sense, and I'm here to help you get there.

I'm a software engineer with a bachelor's degree in informatics, and I have tutored math throughout my own school years, helping classmates and younger students. I focus on understanding why a method works, not just memorizing formulas, so you can solve tasks you haven't seen before.

I teach students at every stage of school, whatever the national curriculum:
- Primary school: arithmetic, fractions, decimals, basic geometry and word problems
- Lower secondary: algebra, equations, ratios and percentages, geometry, introduction to functions
- Upper secondary / high school: functions, trigonometry, sequences, exponential and logarithmic functions, analytic geometry, probability and statistics, introduction to calculus
- Homework help and catching up on topics you missed
- Preparation for school tests, final exams and national or international exams

Every country teaches math a little differently, so bring your own textbook, notes or assignments and we will work with exactly what your school expects. Lessons are 45 minutes long and adapted to your pace: we go through the topic step by step, solve tasks together, and then you try some on your own while I guide you. Students who feel they are "bad at math" are especially welcome.

Lessons are available online, or in person in Zagreb. They can be held in English or Croatian.

Salah

4.96

(27)

Master Python with Personalized Courses

Discover the art of programming with Python courses tailor-made to meet your specific needs. Whether you are a beginner, intermediate or professional, my lessons are suitable for all levels.

Why Choose My Courses?

Personalized Teaching Approach: Each course is tailored to your skill level and individual goals.

Practical Experience: Learn by doing with real-world projects that build your understanding and skills.

Ongoing Support: Get unlimited email support for any questions you have between sessions.

As a Python expert, I have a passion for teaching and sharing my knowledge. My goal is to guide you effectively in your learning journey.

Book Your First Lesson:

Start your journey to Python mastery now by booking your first lesson. Whether you aspire to enter the development field or hone your existing skills, these courses are designed for you.

Patrick

4.96

(27)

Do you need professional support for your data analysis and quantitative methods?

I offer personalized support in data analysis, statistics and quantitative methods**, tailored to your academic or professional needs.

Whether you are a student, doctoral candidate, researcher, consultant or professional, I offer my expertise to support you through the various stages of your project:

Database preparation, cleaning and organization**
Statistical analyses with R, Python, Stata and SPSS**
Statistical and econometric modeling**
Analysis and processing of questionnaires**
Creating dashboards and interactive visualizations with R Shiny and Power BI**
Rigorous interpretation of results**
Creation of charts, graphs and visualizations tailored to your results**
Support in the presentation and dissemination of analyses** in the form of reports, dissertations, theses or scientific publications

Support tailored to your project

Each assignment is carried out with **rigor, pedagogy, and confidentiality**. The objective is not only to obtain statistical results, but also to enable you to **understand the methods used, correctly interpret the results, and present them clearly and relevantly**.

I can intervene in the following areas:

🎓 Academic Projects
Dissertation • Thesis • Scientific article • Research project • Questionnaire analysis

💼 Professional projects
Quantitative studies • Data analysis • Modeling • Reporting • Dashboards • Visualization

Do you want to become self-sufficient in analyzing your data?

For those who wish to go further, I also offer a complete and progressive course enabling you to learn how to explore, manipulate, visualize and analyze your data independently.

Do you have a specific project or issue? Contact me, briefly describing your needs, data, and the tools you wish to use. Together, we can determine the most suitable support.

Amin

4.96

(27)

Data skills can change your career, and you don't need to be a "math person" or have a technical background to learn them. If you can use a computer and you're curious, you can do this. In just 10 hours of one-to-one lessons, you'll go from "I don't know where to start" to analyzing real data on your own.

Maybe you're a student who needs to analyze data for a course or a thesis. Maybe you're looking for your first job in data, finance or business and want a skill that employers ask for. Maybe you already use Excel every day, but your reports take hours and you suspect there's a faster way. Or maybe you've never written a line of code and the idea feels intimidating. This class is built for all of you, and every lesson starts from where you are today.

I'm an engineer, and I work with data, statistics and programming (SQL, Python, R, Excel) every day. I don't teach theory for its own sake. I teach the way I use these tools in real work: you get a real question, a real dataset, and a clear method for turning one into the other.

In 10 hours, you will be able to:

Write SQL queries on your own. Select, filter, sort and group data, combine several tables with JOINs, and answer real questions such as "which product sold the most each month?"
Clean and analyze data in Excel. Use lookup formulas, conditional calculations and PivotTables, and build clear charts, instead of spending hours on manual work.
Build your first Power BI dashboard. Import data, clean it with Power Query, create interactive visuals, and share a report that looks professional.
Explain your results. Turn a business question into a query or a dashboard, check that your results make sense, and present them to someone who doesn't know the data.
Show a finished project. Leave with a portfolio-ready analysis you can use in an interview or in your thesis.

How the 10 hours are organized (we adapt this to your level and goal)

Hours 1-2: Foundations. We define your goal, check your level, and cover your first SQL queries (SELECT, WHERE, ORDER BY).
Hours 3-4: SQL in depth. Grouping and summarizing data, JOINs across tables, and cleaning messy data.
Hours 5-6: Excel for analysis. Advanced formulas, PivotTables, and charts.
Hours 7-8: Power BI. Importing and cleaning data, building visuals, and creating an interactive dashboard.
Hours 9-10: Your project. We put everything together on a realistic dataset (sales, finance, HR or your own data), and I give you feedback and a plan for what to practice next.

If you already know some Excel or SQL, we skip what you know and spend more time on what you need. If you want to go deeper later (for example advanced DAX, Python or statistics), we can continue from the same foundation.

How the lessons work

Every lesson is one-to-one and tailored to you. You practice on your own screen with my guidance, so you learn by doing rather than by watching. Between sessions I can give you short exercises if you want extra practice, and you can send me questions anytime. If you have your own files or work data (anonymized, of course), we can use them, which makes the learning much more relevant. Otherwise I provide practice datasets.

I explain in English or French (or Arabic if that's easier for you), and I'm patient. There are no silly questions. If something doesn't click, I'll explain it another way until it does.

Who this class is for

Students in business, economics, engineering, science or social sciences
Job seekers and career changers who want a first step into data analysis
Professionals who want to automate reports and work faster
Complete beginners. No previous experience with SQL or Power BI is needed.

Jude

4.96

(27)

My lessons are designed to take you from simply following code to genuinely understanding how data science works.

We can cover the complete data science process, including data cleaning, exploratory data analysis, feature engineering, visualisation, statistics, machine learning, model evaluation and communicating results.

Depending on your goals, lessons can include:

Python, pandas, NumPy and scikit-learn
Data cleaning and exploratory analysis
Regression and classification
Decision trees, random forests and boosting
Clustering and dimensionality reduction
Cross-validation and model evaluation
Feature engineering and model interpretation
Neural networks and deep learning foundations
Bayesian modelling and PyMC
Portfolio and interview preparation
Support understanding university modules and projects

I use diagrams, analogies and practical demonstrations to make difficult ideas easier to understand. We will normally begin with an intuitive explanation, look at the underlying logic or mathematics, and then implement the concept in Python.

Lessons are personalised around your level. Complete beginners receive a structured learning path, while experienced students can focus on advanced topics, project guidance, debugging or interview preparation.

You will be encouraged to explain ideas back to me, interpret results and make your own modelling decisions. My goal is not only to help you produce working code, but to help you become an independent and confident data scientist.

Jebabli

4.96

(27)

As a senior computer science professor with over 19 years of experience, I offer courses tailored to students, beginners, and professionals. You will learn computer science, programming, SQL and NoSQL databases, as well as the main concepts of artificial intelligence. The courses are based on clear explanations, concrete examples, and practical exercises. The content is adapted to your level and objectives, whether you want to learn, prepare for an exam, complete a project, or improve your skills.

Nuria

4.96

(27)

Are you studying DAM, DAW, Computer Engineering or other technological training and are you finding programming difficult?

I am Nuria, a computer science teacher with over 10 years of teaching experience and professional experience in systems development and administration.

The classes are online, one-on-one, and fully tailored to your syllabus, level, and goals. We can start from scratch, prepare for a subject or exam, work on assignments and projects, troubleshoot errors, or make progress on a project.

I work with different languages and technologies, including **Java, Python, C, C#, PHP, JavaScript, SQL, OCaml** and others that you may use in your subject.

We can work on content such as:

* programming logic and problem-solving;
* algorithms and data structures;
* object-oriented programming;
* functional programming;
* functions, classes, collections, and exceptions;
* debugging and error resolution;
* access to databases;
* application development;
* Git and version control;
* internships, projects and exam preparation.

My goal is not for you to memorize code or copy solutions, but for you to learn to analyze a problem, break it down into parts, propose a solution, and understand why it works.

In addition to the classes, you will have access to our educational platform with its own documentation, notes, exercises, examples, practices and content from our courses to continue working between sessions.

Mustafa

4.96

(27)

Data Mining Algorithms and Techniques Training Course - Beginner and Intermediate Level, for Computer Science Professionals and Non-Professionals.

The course content is titled: Advanced Analysis and Data Mining.
The book can be searched for using its name or the author's name.

Table of Contents

Chapter 1: Introduction to Advanced Analysis and Data Mining
1-1 What is data mining, its procedures and tools
1-2 What type of data is mined?
1-3 What are databases?
1-4 Relational Database
1-5 Query Language
1-6 Benefits of Database Mining
1-7 months data mining applications
A - Business Intelligence (Business Intelligence)
B - Internet search engines

Chapter Two: Data Recognition
2-1 Data Types, Characteristics, and Features
2-2 Statistical Description of Data
2-3 Visualization of Data
2-4 Measuring data similarity and difference
Chapter Three: Preparing Data for Analysis and Mining
3-1 The importance of preparing data for analysis and mining
3-2 Data Cleanup
3-3 Data Integration
3-4 Data Reduction
3-5 Data Transformation and Data Individualization

Chapter Four: Pattern Discovery and Exploration, Dependency and Correlation Rules
4-1 Basic Concepts
4-2 Shopping basket analysis (example)
4-3 Evaluating the dependency and correlation rules being explored
4-4 Mining Multi-Level Dependency and Linkage Rules
4-5 Mining multidimensional dependency and correlation rules
4-6 Rules of nominal and quantitative dependency and correlation
4-7 Exploring and identifying rare and negative patterns
4-8 Exploring and Determining the Rules of Dependency and Conditional Linkage
4-9 Evaluating dependency and correlation rules and distinguishing between useful and unhelpful ones
4-10 Measuring the type and strength of the relationship in dependency and correlation rules
4-11 Applications of pattern mining in practical life

Chapter Five: Analysis and Mining Using Classification and Prediction Algorithms
5-1 Basic Concepts
5-2 Classification using decision tree extrapolation
5-3 Classification using probability theory (hypothetical theory)
5-4 Classification using hypothetical network theory
5-5 Classification using correlation rules extrapolation
5-6 Classification using neural network algorithm
5-7 Classification using the nearest neighbor algorithm
5-8 Multi-category classification algorithms
5-9 Evaluating the efficiency and selection of classification algorithms

Chapter Six: Analysis and Mining Using Cluster Hashing Algorithms
6-1 Basic Concepts
6-2 Clustering by Division
6-3 Hierarchical Clustering
A. Hierarchical clustering
b. Hierarchical fission
6-4 Probability Clustering
6-5 High-Dimensional Clustering
6-6 Clustering of graphs and network data
6-7 Conditional Clustering
6-8 Cluster Segmentation Assessment

Chapter Seven: Analyzing and Mining Outliers and Complex Data Types
7-1 Basic Concepts
7-2 Types of extreme values
7-3 Ways to Explore Extreme Values
7-4 Complex Data Analysis and Mining

Chapter Eight: Planning Data Mining Operations and Their Applications in Society
8-1 Planning Data Mining Operations
8-2 Data Mining in the Community
8-3 Data mining applications in vital areas of society
8-4 Practical Application: Recommendation System Usage Scenario

Appendix 1: Database Fundamentals
Appendix 2: Data Warehouse Fundamentals
Appendix 3: Glossary of Data Mining Terms

MacDonald

4.96

(27)

Learn practical software development skills through structured lessons tailored to your current experience, learning goals and interests.

These lessons are designed for beginners and developing learners who want to understand how software is planned, developed, tested and improved.

Topics can include programming fundamentals, application development, problem-solving, program logic, working with data, databases, APIs, version control with Git and GitHub, debugging, testing and understanding the software development lifecycle.

Depending on your goals, lessons can also introduce technologies used in modern software development such as JavaScript, TypeScript, React, Node.js and working with front-end and back-end applications.

The focus is on learning through practice rather than simply studying theory. We can work through coding exercises, small applications, software challenges and portfolio projects to help you understand how the different parts of software development work together.

Lessons can also support students who want help understanding an existing project or want to strengthen particular areas of their development knowledge.

No previous programming experience is required for beginner lessons.

Mayssa

4.96

(27)

I specialize in tutoring programming and software development, with a focus on Java, Spring Boot, Angular, SQL. My goal is to help students build a strong understanding of programming while keeping lessons practical, engaging, and appropriately challenging—not overwhelming. This class is designed for students and aspiring developers who want to strengthen their programming skills or start their journey in software engineering. We can work on programming fundamentals, web development, databases, APIs, backend and frontend development. I use practical examples and hands-on exercises to help you understand concepts and apply them to real-world projects.

Ivana

4.96

(27)

I am an experienced computer science teacher with many years of teaching experience and a university degree in Mathematics and Computer Science.

I offer individual online lessons in programming and computer science for school students, as well as support for university students in selected subjects. Lessons can cover Python, MATLAB, SQL and databases, algorithms and programming fundamentals, computer systems, and web development with HTML, CSS and JavaScript.

My lessons are adapted to each student's previous knowledge, current curriculum and individual goals. I explain concepts step by step and focus on understanding the logic behind programming rather than simply memorizing code.

We can work on current school or university topics, programming exercises and assignments, fill gaps in knowledge, prepare for tests and exams, or develop practical programming skills.

Lessons are taught online in Serbian, Bosnian or Croatian, which can be particularly helpful for students from families from the former Yugoslavia who live and study in Germany, Austria, Switzerland or other countries.

Laith

4.96

(27)

Data runs the world, and SQL is how you talk to it. Learn to query, design, and manage databases with confidence.

I've worked with SQL and databases for 3 years, building queries, analyzing data, and securing databases behind real applications for government, financial, and telecom organizations. I'll teach you the practical skills used on the job, not just textbook theory. No boring lectures, just live, hands-on practice.

You'll learn:

How databases work: tables, rows, keys, and relationships
Writing queries with SELECT, WHERE, ORDER BY, GROUP BY, and JOIN
Inserting, updating, and deleting data safely
Database design basics: normalization and schemas
Subqueries, aggregate functions, and useful real-world query patterns
Performance basics such as indexes, plus how to keep your data secure and avoid SQL injection

Perfect for: beginners, students, career changers, developers, analysts, and anyone preparing for a data or IT role.

You'll walk away with the ability to write your own queries, understand how data is stored, and a strong foundation for data analysis, development, or backend work.

No experience needed, just curiosity and a computer. Book your first session and let's get querying!

Cedric

4.96

(27)

Do you want to learn SQL, better understand databases, or get support with your exercises and projects?
As a computer science teacher, I have taught databases at the university level. I offer progressive support tailored to each learner's level.
We can work on data modeling, relational databases, tables and relationships, primary and foreign keys, as well as SQL queries: SELECT, WHERE, JOIN, GROUP BY, subqueries and other concepts depending on your level.
The sessions emphasize practical application: explanation of concepts, concrete examples, exercises, and then problem-solving.
The course can also serve as support to understand a course, prepare for an assessment or progress on a personal or academic project.

Per

4.96

(27)

Go beyond common questioning and answering with AI - learn how to wield AI agents to massively enhance your benefit from using AI.

Use natural language to:

- build software
- automate tedious tasks
- create graphics and visualizations (including accurate charts)
- create animations for any project

For web/software developers:

- increase autonomy
- tools and functions
- hooks
- goals, loops
- sub-agents

Nourhan

4.96

(27)

Welcome! Whether you are a complete beginner or a university student aiming to strengthen your technical foundation, this course is tailored to help you master Python programming, database design, and SQL queries effectively.

In our sessions, we focus on hands-on practical learning rather than passive theory. Here is what we can cover:
• Python Programming fundamentals, data structures, and logic building.
• Relational Databases design, schemas, and ER diagrams.
• Writing clean, optimized SQL queries (SELECT, JOINs, aggregations, subqueries).
• Hands-on practice with real-world datasets and troubleshooting common errors.
• Assistance with university coursework, exam prep, and personal projects.

Lessons are tailored to your pace and goals, ensuring you build confidence in writing code independently. Feel free to reach out with any questions before booking!

Ana

4.96

(27)

Soy Ingeniera Informática por la Universidad Carlos III de Madrid y trabajo como Data Engineer, construyendo plataformas de datos en la nube con Snowflake y Azure. En mis clases aprenderás lo que de verdad se usa en el mundo profesional, explicado de forma clara y práctica.

Puedo ayudarte con:
- Programación desde cero: lógica, Python, Java o C
- Bases de datos y SQL, desde consultas básicas hasta nivel avanzado
- Análisis de datos, Excel y herramientas digitales
- Apoyo en asignaturas de Bachillerato, FP y universidad
- Orientación para quienes quieren reconvertirse al sector de datos

Cada clase se adapta a tu nivel y objetivos, con ejercicios y pequeños proyectos prácticos para que lo aprendido se quede. Doy clases en español e inglés (viví 4 años en EE. UU.).