SQL for Data Analysis: Build a Business Query Portfolio — WalkSelf
4.5 (20) ⏱ 2h 36m 📚 26 lessons 🎧 Audio version

SQL for Data Analysis: Build a Business Query Portfolio

Learn foundational SQL skills to query databases, analyze business metrics, and build a portfolio of practical data projects designed for aspiring analysts.

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About this course

Data drives modern business, and SQL is the essential language used to extract, analyze, and understand that data. Whether you want to transition into a business intelligence role or simply make data-driven decisions, mastering SQL is your first critical step. This text-based course guides you from writing your very first query to analyzing complex datasets. You will build a practical portfolio of business queries, learning how to manipulate data, calculate key performance indicators, and format results for real-world reporting. What you'll learn: • Understand relational database concepts, tables, and foundational SQL syntax • Write queries to filter, sort, and aggregate large datasets effectively • Combine data from multiple sources using various types of JOIN operations • Apply modern SQL techniques like Common Table Expressions (CTEs) for cleaner code • Practice advanced analytical patterns using Window Functions to calculate running totals and rankings • Build a portfolio of practical business scenarios, from customer retention to sales growth analysis The curriculum begins with core terminology and basic database concepts before progressing into hands-on querying exercises. You will read through clear explanations and practice with written code snippets that simulate real business environments. This course is designed for absolute beginners, aspiring data analysts, and business professionals with no prior programming experience. Start your data analysis journey today and build the SQL foundation you need to succeed.

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  • Short & focused
    2h 36m of practical content

Reviews (20)

Samrawit Gashaw ET Verified learner
★ 5 · July 8, 2026

This course walks you through real business scenarios instead of toy examples, which made the JOINs and subqueries actually click for me. By the end I had a handful of queries I could genuinely put in a portfolio. The pacing felt just right for someone coming from spreadsheets.

Akua Gyan GH Verified learner
★ 5 · July 2, 2026

Every module builds toward a query you'd actually use on the job, which kept me motivated the whole way through.

Agustín Torres UY Verified learner
★ 4 · June 28, 2026

Me apunté a este curso para reforzar mi SQL antes de buscar trabajo en análisis de datos, y cumplió bastante bien con lo prometido. Las lecciones avanzan de lo básico, como SELECT y WHERE, hasta consultas más complejas con JOIN, subconsultas y funciones de ventana, todo usando ejemplos de negocio que se sienten reales. Me gustó especialmente que cada módulo termina con una consulta que podés agregar directamente a un portafolio. Lo único que le faltó fue un poco más de profundidad en la parte de optimización de consultas, que se sintió algo apresurada. Aun así, terminé con mucha más confianza para trabajar con bases de datos reales.

Giulia Bianchi IT
★ 5 · June 28, 2026

Corso chiaro e concreto, ho imparato a scrivere query complesse partendo da domande di business reali, non solo esercizi astratti.

Nanda Putra ID Verified learner
★ 4 · June 27, 2026

Awalnya saya cuma tahu SELECT sederhana, tapi kursus ini bikin saya bisa nulis query yang jauh lebih kompleks buat analisis bisnis. Studi kasusnya soal penjualan dan retensi pelanggan bikin materinya kerasa relevan banget, bukan cuma teori doang. Bagian yang paling saya suka itu window function, dijelaskan pelan-pelan sampai ngerti pola perhitungannya. Sayangnya bagian indexing dan performa query cuma dibahas sekilas, padahal itu topik yang menurut saya penting juga. Tapi overall saya keluar dari kursus ini dengan beberapa query yang siap dimasukin ke portofolio.

Eleni Papadopoulos GR Verified learner
★ 5 · June 26, 2026

Finally SQL joins actually make sense.

Lukas Schmidt CH Verified learner
★ 5 · June 24, 2026

Von den Grundlagen bis zu echten Business-Abfragen wird hier alles verständlich erklärt. Am meisten gebracht hat mir, dass ich am Ende ein paar fertige SQL-Projekte für mein Portfolio hatte. Genau der praxisnahe Einstieg, den ich als angehender Analyst gesucht habe.

Іван Петренко UA Verified learner
★ 5 · June 23, 2026

Проходил этот курс, чтобы подтянуть SQL для аналитики, и результат превзошёл ожидания. Всё построено вокруг реальных бизнес-задач: считаешь выручку по сегментам, ищешь отток клиентов, строишь когортный анализ через оконные функции. Объяснения структурированы так, что даже сложные JOIN'ы и подзапросы укладываются в голове без лишнего стресса. К концу курса набралось несколько запросов, которые реально не стыдно показать в портфолио. Отдельный плюс — практика на данных, похожих на настоящие, а не на выдуманные таблицы из трёх строк.

Gabriel Rocha BR
★ 5 · June 19, 2026

O curso me ajudou a entender JOINs e agregações de um jeito bem prático, montando consultas que parecem de verdade para análise de negócios.

Luiza Oliveira BR Verified learner
★ 4 · June 19, 2026

Ótimo curso, só senti falta de mais exercícios.

Maximilian Schmidt AT Verified learner
★ 4 · June 18, 2026

Der Kurs bringt einem Schritt für Schritt bei, wie man SQL-Abfragen für echte Geschäftsfragen schreibt, nicht nur trockene Syntax. Besonders die Übungen zu Aggregationen und JOINs haben mir geholfen, das Ganze wirklich zu verstehen. Nur beim Thema Fensterfunktionen hätte ich mir etwas mehr Zeit gewünscht.

Zanele Mthembu ZA Verified learner
★ 5 · June 18, 2026

The business-focused queries made SQL finally feel useful instead of just theoretical exercises.

عبدالله أحمد AE Verified learner
★ 5 · June 14, 2026

यह कोर्स SQL की बुनियाद से शुरू होकर बिज़नेस मेट्रिक्स तक ले जाता है, जो मेरे लिए बहुत उपयोगी रहा। हर मॉड्यूल के बाद असली डेटा पर क्वेरी लिखने का अभ्यास मिलता है जिससे कॉन्सेप्ट्स दिमाग में बैठ गए। पोर्टफोलियो के लिए तैयार क्वेरीज़ मिलना सबसे अच्छी बात थी।

박서연 KR Verified learner
★ 4 · June 12, 2026

SQL 기초부터 실무 비즈니스 쿼리까지 차근차근 배울 수 있어서 좋았어요. JOIN이랑 서브쿼리 파트에서 실제 데이터로 연습하니까 이해가 확실히 됐습니다. 다만 후반부 포트폴리오 프로젝트는 좀 더 예제가 많았으면 좋았을 것 같아요.

Peter Kováč SK Verified learner
★ 5 · June 12, 2026

Practical, clear, genuinely useful SQL practice.

Thomas Hall NZ Verified learner
★ 4 · June 5, 2026

I went into this course knowing basic SELECT statements and came out comfortable writing multi-table joins and window functions for real business questions. The instructor builds everything around a single company scenario, so by the middle of the course you're not just learning syntax, you're actually answering questions like which products drive repeat purchases. The pacing is steady without dragging, and each section ends with a query you can genuinely show off. My only gripe is that the section on CTEs moves a little fast if you've never used them before, so I had to rewatch it twice. Overall it left me with a portfolio of queries I'm actually proud of.

Nurhayati ID
★ 4 · June 2, 2026

Saya ambil kursus ini karena mau pindah karier ke data analyst, dan ternyata materinya pas banget buat pemula yang udah paham dasar SELECT. Studi kasusnya pakai data bisnis yang realistis, jadi setiap query yang saya tulis terasa relevan, bukan cuma latihan abstrak. Bagian JOIN dan subquery dijelaskan pelan-pelan dengan contoh yang jelas, dan di akhir saya punya beberapa query yang layak dipajang di portofolio. Yang agak kurang cuma bagian optimasi query, rasanya terlalu singkat dibanding materi lain. Tapi secara keseluruhan saya jadi jauh lebih percaya diri pakai SQL untuk analisis.

Jefri Al Buchori ID Verified learner
★ 4 · June 2, 2026

Kursus ini bagus banget buat belajar SQL dari nol sampai bisa bikin query untuk analisis bisnis beneran. Latihan window function-nya lumayan menantang tapi ngebantu banget buat portofolio. Cuma penjelasan soal indexing agak cepat jadi saya harus ulang beberapa kali.

Jonas Hoffmann DE Verified learner
★ 4 · May 30, 2026

Gut erklärt, nur etwas zu schnell.

Jagath Perera LK
★ 4 · May 25, 2026

Solid, business-oriented SQL practice, though the query optimization section could use more depth.

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