Home 浏览课程 Data Science SQL for Data Analysts: From Zero to Joins
Free course English 认证证书 Beginner #data science #data analysis #sql #python #data #joins #tables #analysts

SQL for Data Analysts: From Zero to Joins

If you are new to SQL, this course will help you learn it step by step from the ground up. You will practice writing queries, filtering and sorting data, summarizing results, and using joins to work with real business tables.

4.5 (4 ratings)
80 learners enrolled
506 views
30 lessons
~45 min total
Self-paced, lifetime access

这门课程是关于什么的？

A beginner-friendly, practical course for working professionals who are completely new to SQL. You will learn how to think in tables, write your first queries, filter and sort data, summarize information, and combine tables with joins. The course uses real-world business examples, clear explanations, and hands-on practice throughout. Each lesson ends with short exercises you can complete in 5-15 minutes, and each module begins with a brief introduction to help you connect the skills to real data analysis work.

这门课程的关键信息是什么？

价格 Free
证书 认证证书
时长 45 min
课程单元 30
语言 English
级别 Beginner
考试 Self-paced, lifetime access

Curriculum

6 modules · 30 lessons

1
Module 1: Getting Started with SQL
5 lessons
  • What SQL Is and Why Analysts Use It
  • How Databases and Tables Are Organized
  • Your First Query: SELECT and FROM
  • Reading Query Results and Understanding Data Types
  • Simple SQL Workflow and Best Practices
2
Module 2: Selecting the Right Data
5 lessons
  • Filtering Rows with WHERE
  • Using Multiple Conditions with AND, OR, and NOT
  • Sorting Results with ORDER BY
  • Removing Duplicates and Finding Unique Values
  • Working with NULLs and Basic Text Matching
3
Module 3: Summarizing Data with Aggregation
5 lessons
  • Counting Rows and Measuring Volume
  • Calculating Sums, Averages, Minimums, and Maximums
  • Grouping Data with GROUP BY
  • Filtering Groups with HAVING
  • Intro to Calculated Metrics and Basic Ratios
4
Module 4: Joining Tables for Complete Analysis
5 lessons
  • Why Data Is Split Across Tables
  • Inner Joins: Matching Records That Exist in Both Tables
  • Left Joins: Keeping the Main Table Complete
  • Thinking Carefully About Join Keys and Duplication
  • Joining More Than Two Tables
5
Module 5: From Query to Insight
5 lessons
  • Building Queries Step by Step
  • Using Aliases to Make Queries Easier to Read
  • Checking Results for Accuracy and Reasonableness
  • Interpreting SQL Results in Business Terms
  • Common Beginner Mistakes and How to Avoid Them
6
Module 6: Practice, Review, and Next Steps
5 lessons
  • Review of Core SQL Concepts
  • Practical Business Scenarios
  • Mini Project: Analyze a Simple Dataset
  • How to Keep Practicing SQL After the Course
  • Next Skills to Learn After Joins

Certificate of completion

完成本课程后，您将解锁认证证书 — 可下载为 PDF，附带唯一编号和验证链接。

Each certificate has a unique verifiable link and QR code.

Frequently asked questions

Is this course free to start?

Yes. You can start learning this course for free.

Who is this course for?

This course is designed for learners who want practical, job-relevant skills and a structured path from basics to application.

Do I need prior experience?

No prior experience is required unless specific prerequisites are listed in the course requirements section.

How long does this course take?

The estimated total study time for this course is 45 min.

How does the certificate work?

完成本课程后，您可以下载带有唯一编号和公共验证链接的认证证书。

Learner reviews

4.5
4 ratings
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R
Ryan O. Verified · 11 5月 2026

Good SQL basics

Clear intro to thinking in tables and filtering rows. I just wish there were a few more practice questions on joins.

L
Laura C. Verified · 29 3月 2026

Finished it in a couple sittings. The real business examples made WHERE, ORDER BY, and summarizing data feel pretty straightforward, though I wanted a bit more depth on one exercise.

S
Sophie A. Verified · 22 10月 2025

Joins finally clicked

I learned how to combine tables with joins and use aliases without getting lost. The short end-of-lesson exercises were the part that stood out most.

N
Nathan J. Verified · 24 6月 2025

Practical from the start

The lesson on summarizing data with GROUP BY was the first time it really made sense to me. I liked that every section ended with a quick exercise I could do right away.

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