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databases Online Quiz - 229

Description: databases Online Quiz - 229
Number of Questions: 20
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Tags: databases
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What conditions have to be met before dropping a tablespace?
technology databases

  1. The tablespace must be offline

  2. The tablespace must be online

  3. The tablespace cannot have active segments

  4. The administrator NOT needs the correct system privilege

Show answer
Correct Option: C

Which of the following events can be used to fire triggers?

technology databases

  1. sysdate

  2. Truncate

  3. avg

  4. To_date

Show answer
Correct Option: B

Which names are NOT appropriate database object names?
technology databases

  1. "SELECT"

  2. "_Marketing"

  3. m364DaYs

  4. SELECT

Show answer
Correct Option: D

Which of the following queries can you use to search for employees with the pattern 'A_B' in their names?

technology databases

  1. SELECT last_name FROM employees WHERE last_name LIKE '%A_B%' ESCAPE '\';

  2. SELECT last_name FROM employees WHERE last_name LIKE '%A_B%' ESCAPE;

  3. SELECT last_name FROM employees WHERE last_name LIKE 'A_B%' ESCAPE '%';

  4. SELECT last_name FROM employees WHERE last_name LIKE '%A_B%' ESCAPE '\';

Show answer
Correct Option: D

To write a query that performs an outer join of tables A and B and returns all rows from B, You need to write

technology databases

  1. any outer join

  2. a left outer join

  3. a cross join

  4. a right outer join

Show answer
Correct Option: D

AI Explanation

To answer this question, you need to understand the concept of outer joins.

An outer join is used to combine records from two tables, even if there is no match between the columns being joined. There are three types of outer joins: left outer join, right outer join, and full outer join.

In this case, the question asks for a query that returns all rows from table B. To achieve this, you need to perform a right outer join.

Option A) Any outer join - This option is incorrect because it is too general and does not specify the type of outer join required.

Option B) Left outer join - This option is incorrect because a left outer join would return all rows from table A, not table B.

Option C) Cross join - This option is incorrect because a cross join returns the Cartesian product of the two tables, which is not what the question asks for.

Option D) Right outer join - This option is correct because a right outer join combines all rows from table B, even if there is no match in table A.

Therefore, the correct answer is D) a right outer join.

15 Examine the description of the STUDENTS table: STD_ID NUMBER (4) COURSE_ID VARCHAR2 (10) START_DATE DATE END_DATE DATE Which two aggregate functions are valid on the START_DATE column? (Choose two)

technology databases

  1. SUM(start_date)

  2. AVG(start_date)

  3. COUNT(start_date)

  4. MIN(start_date)

Show answer
Correct Option: C,D

You would like to display the system date in the format "Monday, 01 June, 2001". Which SELECT statement should you use?

technology databases

  1. SELECT TO_DATE (SYSDATE, 'FMDAY, DD Month, YYYY') FROM dual;

  2. SELECT TO_CHAR (SYSDATE, 'FMDD, DY Month, YYYY') FROM dual;

  3. SELECT TO_CHAR (SYSDATE, 'FMDay, DD Month, YYYY') FROM dual;

  4. SELECT TO_CHAR (SYSDATE, 'FMDY, DDD Month, YYYY') FROM dual;

Show answer
Correct Option: C

Which two statements complete a transaction? (Choose two.)

technology databases

  1. DELETE employees;

  2. DESCRIBE employees;

  3. ROLLBACK TO SAVEPOINT C;

  4. ALTER TABLE employees SET UNUSED COLUMN sal;

  5. GRANT SELECT ON employees TO SCOTT;

Show answer
Correct Option: C,D

AI Explanation

To complete a transaction, there are typically two statements involved: COMMIT and ROLLBACK.

Let's go through each option to determine which two statements complete a transaction:

A. DELETE employees; This statement is used to delete data from a table but does not complete a transaction.

B. DESCRIBE employees; This statement is used to describe the structure of a table but does not complete a transaction.

C. ROLLBACK TO SAVEPOINT C; This statement is used to rollback a transaction to a specific savepoint, effectively undoing all changes made after that savepoint. This is one of the statements that completes a transaction.

D. ALTER TABLE employees SET UNUSED COLUMN sal; This statement is used to mark a column as unused in a table, but it does not complete a transaction.

E. GRANT SELECT ON employees TO SCOTT; This statement is used to grant select privileges on a table to a user, but it does not complete a transaction.

Based on the above analysis, the two statements that complete a transaction are:

C. ROLLBACK TO SAVEPOINT C; D. ALTER TABLE employees SET UNUSED COLUMN sal;

Therefore, the correct answer is C and D.

Which object privileges can be granted on a view?
technology databases

  1. none

  2. DELETE, INSERT, SELECT

  3. ALTER, DELETE, INSERT, SELECT

  4. DELETE, INSERT, SELECT, UPDATE

Show answer
Correct Option: D

Which command will delete all data from a table and will not write to the rollback segment?

technology databases

  1. DROP

  2. DELETE

  3. CASCADE

  4. TRUNCATE

Show answer
Correct Option: D

Which Oracle access method is the fastest way for Oracle to retrieve a single row?

technology databases

  1. Primary key access

  2. Access via unique index

  3. Table access by ROWID

  4. Full table scan

Show answer
Correct Option: C

Which character function can be used to return a specified portion of a character string?

technology databases

  1. INSTR

  2. SUBSTR

  3. SUBSTRING

  4. POS

Show answer
Correct Option: B

When a user creates an object without a TABLESPACE clause, where will Oracle store the segment?
technology databases

  1. System tablespace

  2. Users tablespace

  3. Default tablespace for the user

  4. Oracle will give an error

  5. Undefined

Show answer
Correct Option: C

Which character is used to continue a statement in SQL*Plus?
technology databases

  1. *

  2. #

  3. /

  4. -

  5. @

Show answer
Correct Option: D

Assuming today is Friday, 28 August 2009, what is returned by this statement: SELECT to_char(NEXT_DAY(sysdate, 'FRIDAY'), 'DD-MON-RR') FROM dual;
technology databases

  1. 21-AUG-09

  2. 28-AUG-09

  3. 04-SEP-09

  4. 29-AUG-09

  5. 27-AUG-09

Show answer
Correct Option: C

To produce a meaningful result set without any cartesian products, what is the minimum number of conditions that should appear in the WHERE clause of a four-table join?

technology databases

  1. 8

  2. 3

  3. 5

  4. There is no such criteria

Show answer
Correct Option: B

Which of the following can be a valid column name?
technology databases

  1. Column

  2. 1966_Invoices

  3. Catch_#22

  4. #Invoices

  5. None of the above

Show answer
Correct Option: C

Normalization is…
technology databases

  1. the process of arranging information stored in a database in a way, which removes redundancy and ambiguity.

  2. a special way of selecting data

  3. the process of adding primary key to a table

  4. All the above

Show answer
Correct Option: D

A trigger is…
technology databases

  1. a special type of store procedure, executed when certain event occurs

  2. a special type of table

  3. a special type of view

  4. All the above

Show answer
Correct Option: D

Which SQL statement selects all rows from table called Contest, with column ContestDate having values greater or equal to May 25, 20006?
technology databases

  1. SELECT * FROM Contest WHERE ContestDate < '05/25/2006'

  2. SELECT * FROM Contest HAVING ContestDate >= '05/25/2006'

  3. SELECT * FROM Contest WHERE ContestDate >= '05/25/2006'

  4. none of the above

Show answer
Correct Option: D
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