ORACLE SQL CERTIFICATION –QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS)
PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
Core Domains*
- Relational Database Concepts*
- Restricting and Sorting Data*
- Using Single-Row and Group Functions*
, - Subqueries and Joins*
- Managing Schema Objects and DDL*
- Data Manipulation Language (DML)*
- Controlling User Access and Security*
, Introduction*
The purpose of this comprehensive assessment is to evaluate and validate a candidate's proficiency
in Oracle SQL. This exam measures the essential skills and knowledge required to design, query,
and maintain Oracle database structures. The questions span foundational theory, applied
professional knowledge, database security, and industry compliance standards. Utilizing a blend of
multiple-choice and complex, real-world scenario-based problems, this test challenges the
candidate's critical thinking and decision-making capabilities. Successful completion demonstrates a
professional-level command of SQL commands, optimization practices, and data management
workflows essential for modern enterprise database administration and development.*
SECTION ONE: QUESTIONS 1–100
Question 1
Which Oracle SQL command is used to permanently save all pending data transactions made during the
current session?
A. SAVEPOINT
B. ROLLBACK
C. COMMIT
D. MERGE
🟢 Correct Answer: C
🔴 RATIONALE: The COMMIT command ends the current transaction and makes all pending data
changes permanent. SAVEPOINT marks a save point in a transaction, ROLLBACK undoes changes, and
MERGE is a DML statement.
Question 2
, A database developer needs to restrict the rows returned by a query so that only employees with a salary
greater than 50000 and working in department 10 are displayed. Which clause must be used?
A. HAVING
B. WHERE
C. GROUP BY
D. ORDER BY
🟢 Correct Answer: B
🔴 RATIONALE: The WHERE clause filters rows before any groups are formed or aggregate functions
are applied. HAVING filters grouped data, GROUP BY aggregates data, and ORDER BY sorts results.
Question 3
Evaluate this command: SELECT employee_id, last_name, salary FROM employees WHERE last_name
LIKE '_a%'; Which professional standard does this search pattern enforce regarding data retrieval?
A. It retrieves rows where the last name starts with the letter 'a'.
B. It retrieves rows where the last name contains exactly two characters.
C. It retrieves rows where the second character of the last name is 'a'.
D. It retrieves rows where the last name ends with the letter 'a'.
🟢 Correct Answer: C
🔴 RATIONALE: In SQL pattern matching, the underscore (_) wildcard matches exactly one character,
while the percent (%) wildcard matches zero or more characters. Therefore, '_a%' matches any string
where 'a' is the second character.
Question 4
Under regulatory compliance frameworks like GDPR, sensitive data masking is critical. Which single-row
function can be used to replace the first five digits of a identification number with asterisks?
A. INSTR
B. SUBSTR
C. LENGTH
D. REPLACE
PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
Core Domains*
- Relational Database Concepts*
- Restricting and Sorting Data*
- Using Single-Row and Group Functions*
, - Subqueries and Joins*
- Managing Schema Objects and DDL*
- Data Manipulation Language (DML)*
- Controlling User Access and Security*
, Introduction*
The purpose of this comprehensive assessment is to evaluate and validate a candidate's proficiency
in Oracle SQL. This exam measures the essential skills and knowledge required to design, query,
and maintain Oracle database structures. The questions span foundational theory, applied
professional knowledge, database security, and industry compliance standards. Utilizing a blend of
multiple-choice and complex, real-world scenario-based problems, this test challenges the
candidate's critical thinking and decision-making capabilities. Successful completion demonstrates a
professional-level command of SQL commands, optimization practices, and data management
workflows essential for modern enterprise database administration and development.*
SECTION ONE: QUESTIONS 1–100
Question 1
Which Oracle SQL command is used to permanently save all pending data transactions made during the
current session?
A. SAVEPOINT
B. ROLLBACK
C. COMMIT
D. MERGE
🟢 Correct Answer: C
🔴 RATIONALE: The COMMIT command ends the current transaction and makes all pending data
changes permanent. SAVEPOINT marks a save point in a transaction, ROLLBACK undoes changes, and
MERGE is a DML statement.
Question 2
, A database developer needs to restrict the rows returned by a query so that only employees with a salary
greater than 50000 and working in department 10 are displayed. Which clause must be used?
A. HAVING
B. WHERE
C. GROUP BY
D. ORDER BY
🟢 Correct Answer: B
🔴 RATIONALE: The WHERE clause filters rows before any groups are formed or aggregate functions
are applied. HAVING filters grouped data, GROUP BY aggregates data, and ORDER BY sorts results.
Question 3
Evaluate this command: SELECT employee_id, last_name, salary FROM employees WHERE last_name
LIKE '_a%'; Which professional standard does this search pattern enforce regarding data retrieval?
A. It retrieves rows where the last name starts with the letter 'a'.
B. It retrieves rows where the last name contains exactly two characters.
C. It retrieves rows where the second character of the last name is 'a'.
D. It retrieves rows where the last name ends with the letter 'a'.
🟢 Correct Answer: C
🔴 RATIONALE: In SQL pattern matching, the underscore (_) wildcard matches exactly one character,
while the percent (%) wildcard matches zero or more characters. Therefore, '_a%' matches any string
where 'a' is the second character.
Question 4
Under regulatory compliance frameworks like GDPR, sensitive data masking is critical. Which single-row
function can be used to replace the first five digits of a identification number with asterisks?
A. INSTR
B. SUBSTR
C. LENGTH
D. REPLACE
