Course/Module 8/Topic 3 of 3Advanced

Indexes & Performance - Practice

Put your indexes & performance skills to the test with practical exercises and challenges.

50 min•By Priygop Team•Last updated: Feb 2026

Hands-On Practice

Practice makes perfect! In this section, you'll work through practical exercises that reinforce the concepts covered in this module.

Exercises

Exercise 1: Apply basic indexes & performance concepts
Exercise 2: Solve intermediate-level challenges
Exercise 3: Build a mini-project using indexes & performance
Exercise 4: Debug and fix common issues

Practice: Indexes & Performance

Practice: Indexes & PerformanceJavaScript⚠ 1 error

⚠ Syntax Issues (1)

Line 1: JS Error: Unexpected identifier 'query'

💡 Check syntax near the highlighted line.

JavaScript Editor

✕ 1 errorTab = 2 spaces

-- Analyze query performance
EXPLAIN SELECT e.name, d.department_name
FROM employees e
JOIN departments d ON e.dept_id = d.id
WHERE e.salary > 50000;

-- Create an index to speed up the query
CREATE INDEX idx_emp_salary ON employees(salary);
CREATE INDEX idx_emp_dept ON employees(dept_id);

Result

Click ▶ Run to see the result

Edit the code on the left, then click Run

JavaScript|9 lines|290 chars|1 error, 0 warnings

UTF-8

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