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Oracle Introduction to Oracle9i: SQL Sample Questions:
1. Which two statements are true regarding the ORDER BY clause? (Choose two)
A) The sort is in descending order by default.
B) The sort is in ascending by order by default.
C) The ORDER BY clause must precede the WHERE clause.
D) The ORDER BY clause comes last in the SELECT statement.
E) The ORDER BY clause is executed first in the query execution.
F) The ORDER BY clause is executed on the client side.
2. Evaluate the SQL statement:
SELECT LPAD (salary,10,'*')
FROM EMP
WHERE EMP_ID = 1001;
If the employee with the EMP_ID 1001 has a salary of 17000, what is displayed?
A) 17000.00
B) **17000.00
C) an error statement
D) 17000*****
E) ****170.00
3. Evaluate these two SQL statements:
SELECT last_name, salary , hire_date
FROM EMPLOYEES
ORDER BY salary DESC;
SELECT last_name, salary, hire_date
FROM EMPLOYEES
ORDER BY 2 DESC;
What is true about them?
A) The two statements produce identical results.
B) There is no need to specify DESC because the results are sorted in descending order by default.
C) The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
D) The second statement returns a syntax error.
4. Examine the description of the MARKS table:
SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects.
Examine this SELECT statement based on the MARKS table:
SELECT subj1+subj2 total_marks, std_id
FROM marks
WHERE subj1 > AVG (subj1) AND subj2 > AVG(subj2)
ORDER BY total_marks;
What is the result of the SELECT statement?
A) The statement returns an error at the ORDER BY clause.
B) The statement returns an error at the SELECT clause.
C) The statement returns an error at the WHERE clause.
D) The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.
5. Which two are attributes of iSQL*Plus? (Choose two)
A) /SQL*Plus commands are used to manipulate data in tables.
B) /SQL*Plus commands manipulate table definitions in the database.
C) /SQL*Plus is the Oracle proprietary interface for executing SQL statements.
D) /SQL*Plus commands cannot be abbreviated.
E) /SQL*Plus commands are accessed from a browser.
Solutions:
| Question # 1 Answer: B,D | Question # 2 Answer: B | Question # 3 Answer: A | Question # 4 Answer: C | Question # 5 Answer: A,C |
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