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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. You need to design a student registration database that contains several tables storing academic information.
The STUDENTS table stores information about a student. The STUDENT_GRADES table stores information about the student's grades. Both of the tables have a column named STUDENT_ID. The STUDENT_ID column in the STUDENTS table is a primary key.
You need to create a foreign key on the STUDENT_ID column of the STUDENT_GRADES table that points to the STUDENT_ID column of the STUDENTS table. Which statement creates the foreign key?

A) CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id));
B) CREATE TABLE student_grades (student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT student_id_fk REFERENCES (student_id) FOREIGN KEY students(student_id));
C) CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), CONSTRAINT FOREIGN KEY (student_id) REFERENCES students(student_id));
D) CREATE TABLE student_grades(student_id NUMBER(12),semester_end DATE, gpa NUMBER(4,3), student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id));

2. What is true about updates through a view?

A) When you update a view only the constraints on the underlying table will be in effect.
B) When you update a view the constraints on the views always override the constraints on the underlying tables.
C) When you update a view group functions are automatically computed.
D) You cannot update a view with group functions.

3. Which SQL statement accepts user input for the columns to be displayed, the table name, and WHERE condition?

A) SELECT &1, '&2'
FROM &3
WHERE '&last_name = '&4' ';
B) SELECT &1, "&2"
FROM &3
WHERE last_name = '&4';
C) SELECT &1, &2
FROM &3
WHERE last_name = '&4';
D) SELECT &1, '&2'
FROM EMP
WHERE last_name = '&4';

4. Which statement correctly describes SQL and /SQL*Plus?

A) Both SQL and /SQL*plus allow manipulation of values in the database.
B) /SQL*Plus is a language for communicating with the Oracle server to access data; SQL recognizes SQL statements and sends them to the server.
C) SQL manipulates data and table definitions in the database; /SQL*Plus does not allow manipulation of values in the database.
D) /SQL*Plus recognizes SQL statements and sends them to the server; SQL is the Oracle proprietary interface for executing SQL statements.

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

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

Solutions: