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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:
EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2(25)
LAST_NAME VARCHAR2(25)
HIRE_DATE DATE
NEW_EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
NAME VARCHAR2(60)
Which MERGE statement is valid?

A) MERGE INTO new_employees cUSING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET
B) MERGE new_employees c FROM employees e ON (c.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET
C) MERGE INTO new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET
D) name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT value S(e.employee_id, e.first_name ||', '||e.last_name);
E) MERGE new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET
F) name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT INTO new_employees valueS(e.employee_id, e.first_name ||', '||e.last_name);
G) name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT valueS(e.employee_id, e.first_name ||', '||e.last_name);
H) name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT value S(e.employee_id, e.first_name ||', '||e.last_name);

2. Which four are correct guidelines for naming database tables? (Choose four)

A) Must contain only A-Z, a-z, 0-9, _, $, and #.
B) Must contain only A-Z, a-z, 0-+, _, *, and #.
C) Should not be an Oracle Server reserved word.
D) Must begin with either a number or a letter.
E) Must begin with a letter.
F) Must be 1-30 characters long.

3. Which two statements about sequences are true? (Choose two)

A) You use a NEXTVAL pseudo column to look at the next possible value that would be generated from a sequence, without actually retrieving the value.
B) You use a NEXTVAL pseudo column to obtain the next possible value from a sequence by actually retrieving the value from the sequence.
C) You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence.
D) You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence.
E) You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column.
F) If a sequence starting from a value 100 and incremented by 1 is used by more then one application, then all of these applications could have a value of 105 assigned to their column whose value is being generated by the sequence.

4. Examine the structure of the EMPLOYEES table:

You issue these statements:
CREATE table new_emp ( employee_id NUMBER, name VARCHAR2(30));
INSERT INTO new_emp SELECT employee_id , last_name from employees;
Savepoint s1;
UPDATE new_emp set name = UPPER(name);
Savepoint s2;
Delete from new_emp;
Rollback to s2;
Delete from new_emp where employee_id =180;
UPDATE new_emp set name = 'James';
Rollback to s2;
UPDATE new_emp set name = 'James' WHERE employee_id =180;
Rollback;
At the end of this transaction, what is true?

A) You have an employee with the name of James.
B) You have no rows in the table.
C) Your last update fails to update any rows because employee ID 180 was already deleted.
D) You cannot roll back to the same savepoint more than once.

5. Which view should a user query to display the columns associated with the constraints on a table owned by the user?

A) ALL_CONSTRAINTS
B) USER_COLUMNS
C) USER_CONS_COLUMNS
D) USER_CONSTRAINTS
E) USER_OBJECTS

Solutions: