DA Study Guide 2026
Everything you need to pass the DA 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.
📋 DA Exam Format at a Glance
📚 DA Topics to Study (22)
✍️ Sample DA Questions & Answers
1. Which test is appropriate for comparing proportions between two independent groups?
The chi-square test of independence is used to determine if there is a significant association between two categorical variables or proportions.
2. What does the SQL ORDER BY clause do?
ORDER BY sorts query results in ascending (ASC, default) or descending (DESC) order based on specified columns.
3. Which SQL clause limits the number of rows returned by a query?
Different databases use different syntax: LIMIT (MySQL/PostgreSQL), TOP (SQL Server), or ROWNUM (Oracle) to restrict the number of returned rows.
4. What is the primary goal of data mining?
The primary goal of data mining is to extract useful patterns, insights, and knowledge from large datasets. It involves using various techniques to discover hidden relationships and trends that might not be immediately obvious. This knowledge can then be used for decision-making, prediction, and understanding complex systems.
5. What is one-hot encoding used for in data preparation?
One-hot encoding transforms each category level into a separate binary column (0 or 1), enabling algorithms that require numeric input to process categorical data.
6. What is a subquery in SQL?
A subquery is a query embedded within another SQL query, often in the WHERE, FROM, or SELECT clause.
🎯 Free DA Practice Tests
📖 DA Guides & Articles
What Practice Test Geeks adds beyond an AI chat for DA
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 DA mock exam — 90 questions in 90 minutes with a 75% 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 DA 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 DA cheat sheet you can print or save as a PDF.
- DA flashcards built from the same question bank.
- Free DA practice tests with the correct answer shown after each question.