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	Oracle Certification Interview Questions & Answers Below we have listed all the Oracle Certification Interview Questions and answers. Feel free to comment on any Oracle Certification Interview Questions or answer by the comment feature available on the page. To buy an eBook containing 30,000 Interview Questions, with Answers, Click Here. View All Oracle Certification Interview Questions & Answers - Exam Mode / Learning Mode
Oracle Certification Interview Questions & Answers
The Oracle Certified Associate (OCA) credential is the first step toward achieving an Oracle Certified Professional certification. The OCA credential ensures a candidate is equipped with fundamental skills, providing a strong foundation for supporting Oracle products. The Oracle Certification Program is a professional certification program by Oracle Corporation. Three levels of certification are offered in several disciplines, namely: Oracle Certified Associate (OCA), Oracle Certified Professional (OCP), and Oracle Certified Master (OCM).

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Question	Rating	View Answer
Evaluate the following SQL statements: DELETE FROM sales; There are no other uncommitted transactions on the SALES table. Which statement is true about the DELETE statement? A. It would not remove the rows if the table has a primary key B. It removes all the rows as well as the structure of the table C. It removes all the rows in the table and deleted rows can be rolled back D. It removes all the rows in the table and deleted rows cannot be rolled back		View Answer
Which two statements are true regarding single row functions? (Choose two.) A. They accept only a single argument B. They can be nested only to two levels C. Arguments can only be column values or constant D. They always return a single result row for every row of a queried table E. They can return a data type value different from the one that is reference		View Answer
When does a transaction complete? (Choose all that apply.) A. When a DELETE statement is executed B. When a ROLLBACK command is executed C. When a PL/SQL anonymous block is executed D. When a data definition language statement is executed E. When a TRUNCATE statement is executed after the pending transaction		View Answer
Which two statements are true regarding constraints? (Choose two.) A. A foreign key cannot contain NULL values B. A columns with the UNIQUE constraint can contain NULL values C. A constraint is enforced only for the INSERT operation on a table D. A constraint can be disabled even if the constraint column contains data E. All constraints can be defined at the column level as well as the table level		View Answer
You need to calculate the number of days from 1st Jan 2007 till date: Dates are stored in the default format of dd-mm-rr. Which two SQL statements would give the required output? (Choose two.) A. SELECT SYSDATE - '01-JAN-2007' FROM DUAL B. SELECT SYSDATE - TO_DATE('01/JANUARY/2007') FROM DUAL; C. SELECT SYSDATE - TO_DATE('01-JANUARY-2007) FROM DUAL; D. SELECT TO_CHAR(SYSDATE,'DD-MON-YYYY')-'01-JAN-2007' FROM DUAL; E. SELECT TO_DATE(SYSDATE,'DD/MONTH/YYYY')-'01/JANUARY/2007' FROM DUAL;		View Answer
Which three statements are true regarding the data types in Oracle Database 10g/11g? (Choose two.) A. Only One LONG column can be used per table B. A TIMESTAMP data type column stores only time values with fractional seconds C. The BLOB data type column is used to store binary data in an operating system file D. The minimum column width that can be specified for a VARCHAR2 data type column is one E. The value for a CHAR data type column is blanked-padded to the maximum defined column width		View Answer
Which two statements are true regarding single row functions? (Choose two.) A. They accept only a single argument B. They can be nested only to two levels C. Arguments can only be column values or constant D. They always return a single result row for every row of a queried table E. They can return a data type value different from the one that is reference		View Answer
Which statements are correct regarding indexes? (Choose all that apply.) A. When a table is dropped, the corresponding indexes are automatically dropped B. A FOREIGN KEY constraint on a column in a table automatically creates a nonunique key C. A nondeferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a unique index D. For each data manipulation language operation performed, the corresponding indexes are automatically updated		View Answer
What is the use of PARALLEL_ADAPTIVE_MULTI_USER initialization parameter		View Answer
Which two statements are true regarding views? (Choose two.) A. A subquery that defines a view cannot include the GROUP BY clause B. A view is created with the subquery having the DISTINCT keyword can be updated C. A view that is created with the subquery having the pseudo column ROWNUM keyword cannot be updated D. A Data Manipulation Language (DML) operation can be performed on a view that is created with the subquery having all the NOT NULL columns of a table		View Answer
Which two statements are true regarding working with dates? (Choose two.) A. The default internal storage of dates is in the numeric format B. The default internal storage of dates is in the character format C. The RR date format automatically calculates the century from the SYSDATE function and does not allow the user to enter the century D. The RR date format automatically calculates the century from the SYSDATE function but allows the user to enter the century if required		View Answer
How do you use STANDBY_ARCHIVE_DEST parameter and explain it's need?		View Answer
Which three statements/commands would cause a transaction to end? (Choose three.) A. COMMIT B. SELECT C. CREATE D. ROLLBACK E. SAVEPOINT		View Answer
How do you create a multiple databases with the same configuration?		View Answer
What will be the output for this query: select 1 from dual minus select 'a' from dual;		View Answer
Which two statements are true about sequences created in a single instance database? (Choose two.) A. The numbers generated by a sequence can be used only for one table B. DELETE <sequencename> would remove a sequence from the database C. CURRVAL is used to refer to the last sequence number that has been generated D. When the MAXVALUE limit for a sequence for reached, you can increase the MAXVALUE limit by using the ALTER SEQUENCE statement E. When a database instance shuts down abnormally, the sequence numbers that have been cached but not used would be available once again when the database instance is restarted		View Answer
Which two statements are true regarding working with dates? (Choose two.) A. The default internal storage of dates is in the numeric format B. The default internal storage of dates is in the character format C. The RR date format automatically calculates the century from the SYSDATE function and does not allow the user to enter the century D. The RR date format automatically calculates the century from the SYSDATE function but allows the user to enter the century if required		View Answer
What are transportable table spaces and the need to use them?		View Answer
You need to generate a list of all customer last names with their credit limits from the CUSTOMERS table. Those customers who do not have a credit limit should appear last in the list. Which two queries would achieve the required result? (Choose two.) A. SELECT cust_last_name,cust_credit_limit FROM customers ORDER BY cust_credit_limit DESC; B. SELECT cust_last_name,cust_credit_limit FROM customers ORDER BY cust_credit_limit; C. SELECT cust_last_name,cust_credit_limit FROM customers ORDER BY cust_credit_limit NULLS LAST; D. SELECT cust_last_name,cust_credit_limit FROM customers ORDER BY cust_last_name,cust_credit_limit NULLS LAST;		View Answer
Which two statements are true regarding views? (Choose two.) A. A subquery that defines a view cannot include the GROUP BY clause B. A view is created with the subquery having the DISTINCT keyword can be updated C. A view that is created with the subquery having the pseudo column ROWNUM keyword cannot be updated D. A Data Manipulation Language (DML) operation can be performed on a view that is created with the subquery having all the NOT NULL columns of a table		View Answer