DBT Study Guide 2026
Everything you need to pass the DBT exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 DBT Exam Format at a Glance
📚 DBT Topics to Study (38)
✍️ Sample DBT Questions & Answers
1. What does `{{ dbt_utils.union_relations(relations=[ref('a'), ref('b')]) }}` do?
`dbt_utils.union_relations()` generates a UNION ALL query across a list of relations, aligning columns by name and filling missing ones with NULLs.
2. Which command is used to validate the structure and syntax of a dbt project?
The `dbt debug` command is used to validate the structure and syntax of a dbt project, as well as test the connection to your data warehouse. It provides detailed output about your profile configuration, project setup, and any potential issues that might prevent dbt from running successfully. This helps in troubleshooting and ensuring your environment is correctly configured.
3. What does `{# This is a comment #}` do in a dbt SQL file?
Jinja comments (`{# ... #}`) are stripped entirely during compilation and do not appear in the generated SQL sent to the warehouse.
4. What dbt Cloud feature lets a CI job use prod table results for unmodified models instead of rebuilding them?
Deferral (`--defer`) tells dbt to use a different environment's tables for refs that are not being rebuilt in the current run.
5. In a dbt Mesh setup, a model is configured with access: private inside a group. Who can ref() it?
Private models can only be referenced by models belonging to the same group.
6. Why is using CTEs (Common Table Expressions) beneficial for query performance and maintenance?
Common Table Expressions (CTEs) improve query performance and maintenance by breaking down complex SQL queries into smaller, more readable, and manageable logical blocks. While CTEs themselves don't always directly optimize execution plans, they allow the database optimizer to potentially reuse intermediate results and can make queries easier to understand and debug. This modularity often leads to better-structured and more efficient queries.
🎯 Free DBT Practice Tests
📖 DBT Guides & Articles
What Practice Test Geeks adds beyond an AI chat for DBT
An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:
- A timed, full-length DBT mock exam — 65 questions in 90 minutes with a 65% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
- A fixed DBT question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
- Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
- A printable DBT cheat sheet you can print or save as a PDF.
- DBT flashcards built from the same question bank.
- Free DBT practice tests with the correct answer shown after each question.
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