Oracle 1Z0-071 Exam Guide 2026: SQL Certification Preparation

SQL is one of the most important skills in database management, application development, and data analytics. Organizations use SQL to retrieve information, manage records, analyze business data, and maintain relational databases.

The Oracle 1Z0-071: Oracle Database SQL certification exam is designed to validate a candidate's ability to work with SQL in an Oracle Database environment. It covers essential database concepts, SQL queries, functions, joins, subqueries, data manipulation, transactions, and database objects.

This certification is suitable for SQL developers, database administrators, application developers, data analysts, and IT professionals who want to strengthen their Oracle Database skills.

Whether you are beginning your Oracle certification journey or improving your database development knowledge, this guide will help you understand the 1Z0-071 exam structure, syllabus, preparation strategies, and important practice questions.

What Is the Oracle 1Z0-071 Certification?

The Oracle Database SQL 1Z0-071 exam is an associate-level certification examination offered by Oracle.

It evaluates a candidate's ability to use SQL statements to retrieve, manipulate, and manage data in an Oracle Database environment.

Candidates are expected to understand relational database concepts and write SQL statements to perform common database operations.

The certification covers skills such as:

• Retrieving data using SQL SELECT statements
• Filtering and sorting query results
• Using single-row and group functions
• Converting data types and handling conditional expressions
• Joining multiple tables
• Writing subqueries
• Using SQL set operators
• Managing database data with DML statements
• Creating and managing database objects
• Controlling user access and understanding data dictionary views

Passing the 1Z0-071 exam leads to the Oracle Database SQL Certified Associate credential, according to Oracle's certification pathway.

Oracle 1Z0-071 Exam Overview

Before preparing for the exam, candidates should understand its basic structure and requirements.

Important: Older study materials may mention 78 questions. Always confirm the current exam format, price, delivery method, and registration requirements through Oracle before scheduling your examination.

Oracle 1Z0-071 Exam Syllabus and Important Topics

The 1Z0-071 exam covers a broad range of SQL and relational database topics. Oracle publishes exam objectives across multiple subject areas, but does not provide official percentage weightings for individual topics.

The following sections explain the major areas candidates should prepare.

1. Relational Database Concepts

Start with the fundamentals of relational database management systems.

Important topics include:

• Relational database concepts
• Tables, rows, and columns
• Primary keys and foreign keys
• Relationships between tables
• Database schemas
• Entity Relationship Diagrams (ERDs)
• Logical and physical database structures
• Relational database terminology

Preparation tip: Understand how tables are related through primary and foreign keys. Practice reading simple ER diagrams and identifying relationships between database entities.

2. Retrieving Data Using the SQL SELECT Statement

The SELECT statement is the foundation of SQL query writing and an essential exam topic.

Important topics include:

• Basic SELECT syntax
• Selecting individual columns
• Selecting all columns
• Column aliases
• DISTINCT and UNIQUE
• Arithmetic expressions
• Concatenation operators
• Literal character strings
• NULL values
• SQL statement structure

Example:

SELECT employee_id, first_name, salary FROM employees;

This query retrieves employee IDs, first names, and salaries from the employees table.

Preparation tip: Practice writing SELECT statements with different combinations of columns, aliases, expressions, and DISTINCT.

3. Restricting and Sorting Data

SQL provides several operators and clauses to filter and organize query results.

Important topics include:

• WHERE clause
• Comparison operators
• Logical operators
• BETWEEN operator
• IN operator
• LIKE operator
• IS NULL
• ORDER BY clause
• Sorting by multiple columns
• Ascending and descending order
• Row limiting clauses
• Substitution variables

Example:

SELECT employee_id, first_name, salary FROM employees WHERE salary > 5000 ORDER BY salary DESC;

This query retrieves employees earning more than 5,000 and sorts the results from highest to lowest salary.

Preparation tip: Practice combining WHERE conditions with AND, OR, and NOT. Understand how NULL values behave in SQL conditions.

4. Using Single-Row Functions to Customize Output

Single-row functions operate on individual rows and return one result for each row.

Important topics include:

• Character functions
• Number functions
• Date functions
• General functions
• ROUND
• TRUNC
• MOD
• SUBSTR
• LENGTH
• UPPER and LOWER
• INITCAP
• CONCAT
• SYSDATE
• Date arithmetic

Example:

SELECT UPPER(first_name), ROUND(salary, 0) FROM employees;

This query converts employee names to uppercase and rounds salary values to whole numbers.

Preparation tip: Understand the purpose and output of commonly used character, numeric, and date functions. Practice combining multiple functions in a single SQL statement.

5. Using Conversion Functions and Conditional Expressions

Conversion functions help change values from one data type to another. Conditional expressions allow SQL queries to return different results based on specified conditions.

Important topics include:

• Implicit data type conversion
• Explicit data type conversion
• TO_CHAR
• TO_NUMBER
• TO_DATE
• NVL
• NVL2
• NULLIF
• COALESCE
• CASE expressions
• DECODE

Example:

SELECT employee_id,       NVL(commission_pct, 0) AS commission FROM employees;

This query replaces NULL commission values with zero.

Preparation tip: Pay attention to date format masks and the differences between implicit and explicit conversion. Practice using NVL, COALESCE, and CASE expressions.

6. Reporting Aggregated Data Using Group Functions

Group functions summarize information across multiple rows.

Important topics include:

• COUNT
• SUM
• AVG
• MIN
• MAX
• GROUP BY
• HAVING
• Grouping multiple columns
• Handling NULL values in aggregate functions
• ROLLUP
• CUBE
• GROUPING SETS

Example:

SELECT department_id, AVG(salary) FROM employees GROUP BY department_id;

This query calculates the average salary for each department.

Preparation tip: Understand the difference between WHERE and HAVING. Remember that WHERE filters rows before grouping, while HAVING filters grouped results.

7. Displaying Data from Multiple Tables

Relational databases store information across multiple tables. SQL joins help retrieve related information from these tables.

Important topics include:

• Equijoins
• Nonequijoins
• Self joins
• Inner joins
• Outer joins
• Cross joins
• Natural joins
• ANSI join syntax
• Joining tables using ON
• Joining tables using USING

Example:

SELECT e.employee_id,       e.first_name,       d.department_name FROM employees e JOIN departments d ON e.department_id = d.department_id;

This query retrieves employee details along with their department names.

Preparation tip: Practice different join types and understand which rows are returned by each join. Pay particular attention to LEFT, RIGHT, and FULL OUTER JOIN behavior.

8. Using Subqueries to Solve Queries

Subqueries are queries placed inside another SQL statement. They help solve problems that require intermediate results.

Important topics include:

• Single-row subqueries
• Multiple-row subqueries
• Nested subqueries
• Correlated subqueries
• Scalar subqueries
• IN, ANY, and ALL operators
• EXISTS and NOT EXISTS
• WITH clause
• Subqueries in SELECT, FROM, and WHERE clauses
• Using subqueries with UPDATE and DELETE

Example:

SELECT employee_id, first_name, salary FROM employees WHERE salary > (    SELECT AVG(salary)    FROM employees );

This query retrieves employees whose salaries are higher than the overall average salary.

Preparation tip: Practice identifying whether a subquery returns one row or multiple rows. Understand how correlated subqueries work and why NULL values can affect NOT IN conditions.

9. Using Set Operators

Set operators combine the results of multiple SELECT statements.

Important topics include:

• UNION
• UNION ALL
• INTERSECT
• MINUS
• Combining query results
• Column compatibility requirements
• Data type compatibility
• Ordering set-operation results

Example:

SELECT department_id FROM employees UNION SELECT department_id FROM departments;

UNION combines the results and removes duplicate rows.

Preparation tip: Understand the difference between UNION and UNION ALL. Remember that the SELECT statements combined using set operators must have compatible column counts and corresponding data types.

10. Managing Data Using DML Statements

Data Manipulation Language (DML) statements allow users to insert, update, delete, and merge records.

Important topics include:

• INSERT
• UPDATE
• DELETE
• MERGE
• Multi-table INSERT
• Conditional INSERT
• Transaction control
• COMMIT
• ROLLBACK
• SAVEPOINT

Example:

UPDATE employees SET salary = 6000 WHERE employee_id = 101; COMMIT;

This statement updates the salary of the employee with ID 101 and commits the transaction.

Preparation tip: Practice INSERT, UPDATE, and DELETE statements. Understand how COMMIT, ROLLBACK, and SAVEPOINT affect database transactions.

11. Managing Tables, Indexes, Synonyms, and Sequences

Oracle Database uses several schema objects to organize and improve database operations.

Important topics include:

• Creating and modifying tables
• Managing table structures
• Creating indexes
• Managing synonyms
• Creating sequences
• Dropping database objects
• Understanding object dependencies

Preparation tip: Learn the purpose of each database object and practice the SQL statements used to create, modify, and remove them.

12. Using DDL to Manage Tables and Relationships

Data Definition Language (DDL) statements define and modify database structures.

Important topics include:

• CREATE
• ALTER
• DROP
• TRUNCATE
• Table constraints
• Primary key constraints
• Foreign key constraints
• UNIQUE constraints
• NOT NULL constraints
• CHECK constraints
• Referential integrity

Preparation tip: Understand how constraints protect data integrity. Pay attention to the difference between DELETE, TRUNCATE, and DROP.

13. Managing Views

Views provide a way to present selected data from one or more database tables.

Important topics include:

• Creating views
• Replacing views
• Updating views
• Dropping views
• Simple and complex views
• Read-only views
• WITH CHECK OPTION
• WITH READ ONLY

Preparation tip: Understand how views simplify data access and how view restrictions affect DML operations.

14. Controlling User Access

Database security is important for protecting sensitive information and controlling access to database objects.

Important topics include:

• Database users
• System privileges
• Object privileges
• Roles
• GRANT
• REVOKE
• User access management

Preparation tip: Understand the difference between system privileges and object privileges. Practice identifying which privileges are required for common database operations.

15. Managing Objects with Data Dictionary Views

Oracle Database provides data dictionary views that contain information about database objects and structures.

Important topics include:

• USER_OBJECTS
• USER_TABLES
• USER_VIEWS
• USER_CONSTRAINTS
• USER_INDEXES
• ALL_OBJECTS
• ALL_TABLES
• DBA_OBJECTS
• Understanding object metadata

Preparation tip: Learn how data dictionary views help users inspect database objects, constraints, indexes, and other metadata.

16. Managing Data in Different Time Zones

Oracle Database supports date and time operations across different time zones.

Important topics include:

• DATE data type
• TIMESTAMP
• TIMESTAMP WITH TIME ZONE
• TIMESTAMP WITH LOCAL TIME ZONE
• Time zone conversion
• Session time zones
• Date and time functions

Preparation tip: Understand the differences between DATE and TIMESTAMP data types. Practice working with time zone information and date conversion functions.

Effective Preparation Strategies for the Oracle 1Z0-071 Exam

A practical study approach can help you improve your SQL skills and prepare for the examination.

1. Start with SQL Fundamentals

Build a strong foundation in relational databases, tables, keys, relationships, and basic SQL syntax.

Do not move directly to advanced queries without understanding how SELECT, WHERE, and ORDER BY work.

2. Practice SQL Queries Every Day

Reading SQL examples is not enough. Write and execute queries regularly using an Oracle Database practice environment.

Practice:

• Retrieving records
• Filtering data
• Sorting results
• Using functions
• Joining tables
• Writing subqueries
• Grouping and summarizing data

3. Focus on Joins and Subqueries

Joins and subqueries are essential SQL skills. Practice solving the same database problem using different query approaches.

Understand how each join type changes the returned results and how single-row and multiple-row subqueries behave.

4. Understand DDL, DML, and Transaction Control

Learn the purpose of each SQL statement category.

• DDL defines database structures.
• DML manipulates database records.
• Transaction control manages changes to database data.

Practice CREATE, ALTER, INSERT, UPDATE, DELETE, COMMIT, ROLLBACK, and SAVEPOINT.

5. Use Practice Questions and Mock Tests

Practice questions help you identify weak areas and become familiar with exam-style SQL problems.

After completing a test, review incorrect answers and execute relevant SQL statements in a practice database.

6. Revise Oracle-Specific SQL Behavior

Some SQL concepts behave differently depending on the database platform.

Focus on Oracle-specific functions, date handling, NULL behavior, data dictionary views, sequences, synonyms, and other Oracle database features.

Four-Week Oracle 1Z0-071 Study Plan

Use this four-week schedule to organize your preparation.

Recommended Daily Study Routine

A daily schedule of approximately 90 minutes can help you maintain consistent progress.

• 20 minutes: Review SQL concepts and syntax.
• 40 minutes: Write and execute SQL queries.
• 20 minutes: Solve practice questions.
• 10 minutes: Review mistakes and revise notes.

Candidates with limited SQL experience may benefit from extending the preparation period and spending more time on hands-on query practice.

Oracle 1Z0-071 Practice Questions and Answers

The following five original practice questions cover important SQL concepts. They are learning examples, not actual Oracle examination questions.

Question 1: SQL SELECT and Filtering

A database developer wants to retrieve employees whose salary is greater than 5,000 and display the highest salaries first. Which SQL statement is correct?

A.

SELECT employee_id, salary FROM employees WHERE salary > 5000 ORDER BY salary DESC;

B.

SELECT employee_id, salary FROM employees ORDER BY salary DESC WHERE salary > 5000;

C.

SELECT employee_id, salary FROM employees GROUP BY salary > 5000;

D.

SELECT employee_id, salary FROM employees WHERE salary DESC > 5000;

Correct Answer: A

Explanation: The WHERE clause filters records based on the salary condition, and ORDER BY salary DESC sorts the results from highest to lowest salary. The SQL statement places WHERE before ORDER BY.

Question 2: SQL Group Functions

A developer wants to calculate the average salary for each department. Which SQL statement should be used?

A.

SELECT department_id, AVG(salary) FROM employees GROUP BY department_id;

B.

SELECT department_id, AVG(salary) FROM employees ORDER BY department_id;

C.

SELECT AVG(department_id), salary FROM employees;

D.

SELECT department_id, salary FROM employees HAVING AVG(salary);

Correct Answer: A

Explanation: AVG calculates the average salary, while GROUP BY department_id creates a separate group for each department. This produces one average salary result per department.

Question 3: SQL Joins

An employee table contains a department_id column, and a departments table contains department_id and department_name. Which join condition correctly connects the two tables?

A.

SELECT e.first_name, d.department_name FROM employees e JOIN departments d ON e.department_id = d.department_id;

B.

SELECT e.first_name, d.department_name FROM employees e JOIN departments d ON e.employee_id = d.department_id;

C.

SELECT e.first_name, d.department_name FROM employees e JOIN departments d ON e.salary = d.department_name;

D.

SELECT e.first_name, d.department_name FROM employees e JOIN departments d;

Correct Answer: A

Explanation: The department_id column connects employees with their corresponding departments. The ON condition specifies the matching columns used to retrieve related records.

Question 4: SQL Subqueries

A developer wants to find employees whose salary is greater than the average salary of all employees. Which query is correct?

A.

SELECT employee_id, salary FROM employees WHERE salary > (    SELECT AVG(salary)    FROM employees );

B.

SELECT employee_id, salary FROM employees WHERE salary = AVG(salary);

C.

SELECT employee_id, salary FROM employees GROUP BY salary > AVG(salary);

D.

SELECT employee_id, salary FROM employees WHERE AVG(salary) > salary;

Correct Answer: A

Explanation: The inner query calculates the average salary across all employees. The outer query retrieves employees whose salaries are greater than that result.

Question 5: Transaction Control

A developer updates employee records but wants to undo the changes before they are permanently saved. Which SQL statement should be used?

A. COMMIT
B. ROLLBACK
C. CREATE
D. GRANT

Correct Answer: B. ROLLBACK

Explanation: ROLLBACK reverses uncommitted transaction changes. COMMIT permanently saves the transaction changes, while CREATE and GRANT are used for database structure and privilege management.

Frequently Asked Questions (FAQs)

1. What is the Oracle 1Z0-071 exam?

The Oracle 1Z0-071 exam is the Oracle Database SQL certification examination. It evaluates knowledge of SQL queries, relational database concepts, functions, joins, subqueries, data manipulation, and database object management.

2. How many questions are included in the 1Z0-071 exam?

Current published English exam information indicates 63 questions. Older preparation materials may mention 78 questions, so candidates should confirm the current format through Oracle before registering.

3. What is the duration of the Oracle 1Z0-071 exam?

The published exam duration is 120 minutes.

4. What is the passing score for 1Z0-071?

The published passing score is 63%.

5. What topics are covered in the Oracle 1Z0-071 exam?

The exam covers relational database concepts, SELECT statements, filtering and sorting, SQL functions, conversion functions, group functions, joins, subqueries, set operators, DML, DDL, views, indexes, synonyms, sequences, user access, data dictionary views, and time zones.

6. Is SQL programming experience required for the 1Z0-071 exam?

Prior SQL experience is helpful, but candidates should review the official Oracle exam requirements. Practicing SQL queries in an Oracle Database environment is strongly recommended.

7. Which SQL topics should I focus on most?

Focus on SELECT statements, WHERE conditions, functions, joins, subqueries, GROUP BY, HAVING, DML, and transaction control. Also review Oracle-specific database objects and data dictionary views.

8. How long does it take to prepare for the 1Z0-071 exam?

Preparation time depends on your existing SQL knowledge. Candidates with basic SQL experience may use a four-week study plan, while beginners may need additional time for hands-on practice.

 Final Thoughts

The Oracle 1Z0-071 certification is a useful credential for professionals who want to demonstrate their SQL knowledge and strengthen their understanding of Oracle Database.

To prepare effectively, focus on building strong SQL fundamentals, writing queries regularly, understanding joins and subqueries, and practicing database operations. Do not depend only on memorizing syntax. Learn how SQL statements work and how to apply them to practical database problems.

Follow a structured study plan, review the official exam objectives, and use practice questions to identify areas that need improvement.

Start your Oracle 1Z0-071 exam preparation with Clearcatnet.com and take the next step toward strengthening your Oracle Database SQL skills.

Written By:Tannu Singh

Published on: 31/10/2026

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