SQL Database Quizzes
Improve your SQL skills with our database quiz and test questions. Practice writing queries, using joins, and working with tables. These exercises help your understanding of how databases work and will test your ability to write SQL code for real-world applications.
About SQL Database Quiz
Each SQL Database quiz consists of multiple questions, each with three to four possible answers. Only one answer is correct for each question. Select the answer you believe is correct, then click the "Check My Answers" button to see your results.
If you answer at least 75% of the questions correctly, you pass the quiz! This indicates you have a solid understanding of SQL Database concepts and are ready to advance to more challenging topics.
After submitting your quiz, you'll receive immediate feedback with detailed explanations for each question. This helps you understand not just what the correct answer is, but why it's correct—reinforcing your learning and helping you master SQL Database.
Quick Tips
- Read each question carefully before selecting your answer
- Review the code examples when provided
- You can retake quizzes as many times as you want
- Sign in to save your progress and track your performance
Available Quizzes
Foundations and Basics
A 50-question beginner SQL database quiz covering essential SQL commands, data retrieval, table structures, constraints, data types, and simple relational concepts.
Basic Query Selection
A 40-question challenge focused on SELECT operations including filtering, sorting, limiting, pattern matching, aliases, expressions, and DISTINCT usage.
Filter, Sort, and Alias Essentials
A 50-question quiz focused on filtering rows, sorting results, and using aliases to improve query readability and control output.
Data Change Operations (Insert, Update, Delete)
A 75-question quiz on INSERT, UPDATE, and DELETE operations, exploring values, safety rules, filtering, and practical modification patterns.
Null and Type Essentials
A 40-question quiz exploring how NULL behaves, how data types work, conversions, comparisons, and common pitfalls.
Aggregation and Groups
A 50-question quiz exploring aggregate functions, grouping rules, filtering with HAVING, and practical summarization patterns.
Relational Join Logic
A 50-question quiz exploring join operations including inner joins, left joins, right joins, full joins, cross joins, and join conditions.
Set Operation Principles
A 50-question quiz exploring UNION, UNION ALL, INTERSECT, and EXCEPT with practical patterns, duplicates, ordering, and dataset comparison.
Function Operations Core
A 50-question quiz covering string, numeric, and date functions used in data querying, formatting, comparisons, and expression manipulation.
Keys and Relationship Core
A 50-question quiz covering primary keys, foreign keys, one-to-many structures, many-to-many linking, and relationship reasoning.
Constraint Rules
A 50-question quiz covering NOT NULL, UNIQUE, CHECK, DEFAULT, primary keys, foreign keys, and constraint logic.
Structured Design
A 40-question quiz exploring normalization forms, schema modeling, functional dependencies, redundancy reduction, and relational structuring.
Subquery Logic
A 35-question quiz exploring basic subqueries, correlated subqueries, filtering, comparisons, scalar subqueries, and nested query reasoning.
Conditional Flow
A 35-question quiz exploring conditional logic, CASE expressions, value mapping, multi-branch logic, derived classifications, and conditional aggregation.
Indexing
A 35-question quiz covering indexing fundamentals, lookup efficiency, B-tree behavior, composite indexes, filtering use cases, and index selection strategy.