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Oracle Introduction to Oracle9i: SQL Sample Questions:

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

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

2. You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows.
Which statement is valid?

A) ALTER TABLE commercials
CHANGE (description CHAR2(2000));
B) You cannot increase the size of a column if the table has rows.
C) ALTER TABLE commercials
MODIFY (description VARCHAR2(2000));
D) ALTER TABLE commercials
CHANGE (description VARCHAR2(2000));
E) ALTER TABLE commercials
MODIFY (description CHAR2(2000));

3. Examine the data in the EMPLOYEES and DEPARTMENTS tables.

You want to retrieve all employees, whether or not they have matching departments in the departments table. Which query would you use?

A) SELECT last_name, department_name FROM employees(+) , departments ON (e.department_id = d.department_id);
B) SELECT last_name, department_name FROM employees , departments(+);
C) SELECT last_name, department_name FROM employees JOIN departments (+);
D) SELECT last_name, department_name FROM employees e RIGHT OUTER JOIN departments d ON (e.department_id = d.department_id);
E) SELECT last_name, department_name FROM employees(+) e JOIN departments d ON (e.department_id = d.department_id);
F) SELECT last_name, department_name FROM employees e LEFT OUTER JOIN departments d ON (e.department_id = d.department_id);

4. Which two are true about aggregate functions? (Choose two.)

A) You can use aggregate functions in any clause of a SELECT statement.
B) You cannot group the rows of a table by more than one column while using aggregate functions.
C) You can mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.
D) You can use aggregate functions on a table, only by grouping the whole table as one single group.
E) You can pass column names, expressions, constants, or functions as parameter to an aggregate function.
F) You can use aggregate functions only in the column list of the select clause and in the WHERE clause of a SELECT statement.

5. The STUDENT_GRADES table has these columns: STUDENT_ID NUMBER(12)
SEMESTER_END DATE
GPA NUMBER(4,3)
The registrar requested a report listing the students' grade point averages (GPA) sorted from highest grade point average to lowest.
Which statement produces a report that displays the student ID and GPA in the sorted order requested by the registrar?

A) SELECT student_id, gpa FROM student_grades ORDER BY gpa DESC;
B) SELECT student_id, gpa FROM student_grades ORDER BY gpa ASC;
C) SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa DESC;
D) SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa;
E) SELECT student_id, gpa FROM student_grades SORT ORDER BY gpa ASC;
F) SELECT student_id, gpa FROM student_grades ORDER BY gpa;

Solutions: