Introduction
Databases
SQL Introduction
Check your understanding of core SQL concepts: SELECT queries, filtering, sorting, data types, tables and keys, and aggregate functions. This free introduction assessment helps you practice foundational SQL skills used in common relational databases.
Free, forever
10 minutes
No credit card required
Verifiable credential included
Sample question — try it
The VARCHAR data type is used to store whole numbers without decimals.
Skills Tested
- SELECT Basics
- Filtering & Sorting
- Data Types
- Tables & Keys
- Aggregate Functions
Assessment Details
10
Questions
65%
To Pass
10 min
Time Limit
90%
Avg Score
5
(1 review)
- Questions are drawn randomly from the question pool each attempt
- Answers cannot be reviewed after submission
- Escalating cooldown between attempts: 8h, 24h, 72h, then 1 week
- Free skill badge with a 30-day shareable verification token
- PDF certificate and Open Badge 2.0 are included with Level 1+ certifications
Free
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Track
Databases → MySQL