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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which SQL statement returns a numeric value?

A) SELECT ROUND(hire_date) FROM EMP;
B) SELECT sysdate-hire_date FROM EMP;
C) SELECT ADD_MONTHS(MAX(hire_Date), 6) FROM EMP;
D) SELECT TO_NUMBER(hire_date + 7) FROM EMP;

2. Which three statements about subqueries are true? (Choose three.)

A) The subquery and main query must retrieve data from the same table.
B) A main query can have more than one subquery.
C) A subquery can have more than one main query.
D) The subquery and main query can retrieve data from different tables.
E) Multiple columns or expression can be compared between the subquery and main query.
F) Only one column or expression can be compared between the subquery and main query.

3. You added a PHONE_NUMBER column of NUMBER data type to an existing EMPLOYEES table. The EMPLOYEES table already contains records of 100 employees. Now, you want to enter the phone numbers of each of the 100 employees into the table.
Some of the employees may not have a phone number available.
Which data manipulation operation do you perform?

A) ADD
B) INSERT
C) ENTER
D) MERGE
E) UPDATE
F) You cannot enter the phone numbers for the existing employee records.

4. Which constraint can be defined only at the column level?

A) CHECK
B) NOT NULL
C) PRIMARY KEY
D) FOREIGN KEY
E) UNIQUE

5. Evaluate the set of SQL statements:
CREATE TABLE dept (deptno NUMBER(2), dname VARCHAR2(14), loc VARCHAR2(13)); ROLLBACK; DESCRIBE DEPT
What is true about the set?

A) The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist.
B) The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.
C) The ROLLBACK statement frees the storage space occupies by the DEPT table.
D) The DESCRIBE DEPT statement displays the structure of the DEPT table.

Solutions: