CS10337 - Lecture #5

What is the purpose of transaction locking?

• To prevent unauthorized access

• To ensure data integrity during concurrent access

• To speed up data retrieval

• To encrypt data

Which of the following is a correct way to insert a row without specifying column names?

• INSERT INTO table_name (column1, column2) VALUES (value1, value2)

• INSERT INTO table_name VALUES (value1, value2)

• INSERT INTO table_name SET column1 = value1, column2 = value2

• INSERT INTO table_name (column1, column2) SET (value1, value2)

What is the correct syntax for using a subquery to insert one or more rows into a table?

• INSERT INTO table_name VALUES (value_list)

• INSERT [INTO] table_name [(column_list)] select_statement

• SELECT * FROM table_name WHERE condition

• UPDATE table_name SET column = value

What is the default mode for MySQL Workbench regarding updates?

• Safe update mode

• Fast update mode

• Manual update mode

• Automatic update mode

What does safe update mode prevent in MySQL Workbench?

• Deleting rows without a WHERE clause

• Updating rows if the WHERE clause is omitted

• Inserting rows without a primary key

• Creating tables without a foreign key

Which SQL statement would delete a row from 'invoice_line_items' where the invoice_id is 78 and invoice_sequence is 2?

• DELETE FROM invoice_line_items WHERE invoice_id = 78 AND invoice_sequence = 2

• DELETE FROM invoice_line_items WHERE invoice_id = 78 OR invoice_sequence = 2

• DELETE FROM invoice_line_items WHERE invoice_id = 77 AND invoice_sequence = 2

• DELETE FROM invoice_line_items WHERE invoice_id = 78 AND invoice_sequence = 3

How can you change “Hansen” into “Nilsen” in the “LastName” column in the Persons table?

• UPDATE Persons SET LastName=’Hansen’ INTO LastName=’Nilsen’

• MODIFY Persons SET LastName=’Nilsen’ WHERE LastName=’Hansen’

• MODIFY Persons SET LastName=’Hansen’ INTO LastName=’Nilsen’

• UPDATE Persons SET LastName=’Nilsen’ WHERE LastName=’Hansen’

Which of the following is NOT part of the ACID properties?

• Atomicity

• Concurrency

• Consistency

• Durability

What does the “Atomicity” property ensure in a transaction?

• Every query in a transaction must be read-only

• Transactions must be written in uppercase

• The entire transaction is processed as a single unit – all or nothing

• Transactions run one at a time only

True or False: InnoDB supports all four ACID properties: Atomicity, Consistency, Isolation, and Durability.

• True

• False