Oracle SQL Study Guide 2026

Everything you need to pass the Oracle SQL 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.

📋 Oracle SQL Exam Format at a Glance

Questions

120 min

Time Limit

63.00%

Passing Score

Take a Full Oracle SQL Exam Simulation →

📚 Oracle SQL Topics to Study (23)

✍️ Sample Oracle SQL Questions & Answers

1. What is a deadlock in Oracle SQL?

✓ A situation where two or more transactions are each waiting for the other to release locks, creating a circular wait

A deadlock occurs when two or more transactions each hold locks that the other needs, creating a circular wait that Oracle detects and resolves by rolling back one transaction.

2. Which of the following statements about subquery operators is correct?

✓ The <ANY operator means less than the maximum.

The `<ANY` operator in SQL subqueries means that the value being compared is less than at least one of the values returned by the subquery. This effectively means the value is less than the maximum value present in the subquery's result set. For example, `salary < ANY (SELECT salary FROM employees WHERE department_id = 10)` would return employees whose salary is less than the highest salary in department 10.

3. What does the NULLIF(expr1, expr2) function return in Oracle SQL?

✓ NULL if expr1 equals expr2, otherwise expr1

NULLIF returns NULL when both arguments are equal; otherwise it returns the first argument.

4. What does the TRUNC(45.789) function return in Oracle SQL?

✓ 45

TRUNC without a second argument removes all decimal places, returning the integer portion 45 without rounding.

5. Which read phenomenon is prevented by Oracle's READ COMMITTED isolation level?

✓ Dirty reads

READ COMMITTED prevents dirty reads because queries only see data that was committed before the query started, never uncommitted data from other transactions.

6. Which Oracle SQL analytic function calculates a running total?

✓ SUM() OVER (ORDER BY)

SUM() used as an analytic function with OVER (ORDER BY column) computes a cumulative running total up to each row.

🎯 Free Oracle SQL Practice Tests

Test · 9 questions Test · 9 questions Oracle SQL Transactions and Concurrency Control · 7 questions Oracle SQL Transactions and Concurrency Control · 7 questions Oracle SQL Transactions and Concurrency Control · 7 questions Oracle SQL Functions · 6 questions Oracle SQL Joins and Subqueries · 6 questions Oracle SQL DML Operations · 6 questions Oracle SQL DDL and Schema Objects · 6 questions Oracle SQL DML Operations · 6 questions

📖 Oracle SQL Guides & Articles

Your Oracle SQL Study Path

1. Learn with Flashcards → 2. Drill Practice Tests → 3. Take the Full Exam Simulation

🃏 Oracle SQL Flashcards (147)🏆 Oracle SQL Exam Simulation

What Practice Test Geeks adds beyond an AI chat for Oracle SQL

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 Oracle SQL mock exam — 63 questions in 120 minutes with a 63% 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 Oracle SQL 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 Oracle SQL cheat sheet you can print or save as a PDF.
Oracle SQL flashcards built from the same question bank.
Free Oracle SQL practice tests with the correct answer shown after each question.

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