To answer this question, you need to understand how statements are executed in SQL*Plus.

In SQL*Plus, a hyphen (-) character is used to continue a statement onto the next line.

Option A) / ' - This option is incorrect because the forward slash (/) character is used to execute a SQL or PL/SQL statement in SQL*Plus, but it is not used to continue a statement onto the next line.

Option B) * ' - This option is incorrect because the asterisk (*) character is not used to continue a statement in SQL*Plus.

Option C) - ' - This option is correct because the hyphen (-) character is used to continue a statement onto the next line in SQL*Plus.

Option D) = ' - This option is incorrect because the equal sign (=) character is not used to continue a statement in SQL*Plus.

The correct answer is Option C) - '. This option is correct because the hyphen (-) character is used to continue a statement onto the next line in SQL*Plus.

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To answer this question, you need to understand the different types of triggers in SQL.

Option A) FOR EACH ROW trigger on the EMP table - This option is correct because it specifies a trigger that is fired for each row that is changed in the EMP table. In this case, the trigger will be used to monitor every row that is changed in the EMP table and place the information into the AUDIT_TABLE.

Option B) Statement-level Trigger on the EMP table - This option is incorrect because a statement-level trigger is fired only once for each SQL statement, regardless of the number of rows affected. It would not be suitable for monitoring every row that is changed in the EMP table.

Option C) FOR EACH ROW trigger on the AUDIT_TABLE table - This option is incorrect because it specifies a trigger on the AUDIT_TABLE table, not the EMP table. The requirement is to create a trigger on the EMP table.

Option D) Statement-level Trigger on the AUDIT_TABLE - This option is incorrect because it specifies a statement-level trigger on the AUDIT_TABLE, which would not be suitable for monitoring every row that is changed in the EMP table.

The correct answer is A) FOR EACH ROW trigger on the EMP table. This option is correct because it specifies a trigger that is fired for each row that is changed in the EMP table, which is what is required in this case.

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To answer this question, you need to understand the different components of a database trigger.

A database trigger is a stored procedure that is automatically executed in response to a specific event in the database. The trigger body contains the set of SQL statements that are executed when the trigger is fired.

The trigger type determines the number of times the trigger body executes. There are two types of triggers:

1. Statement-level triggers: These triggers are fired once for each triggering event, regardless of the number of rows affected. This means that the trigger body is executed only once for each triggering event, regardless of the number of rows involved in the event.

2. Row-level triggers: These triggers are fired once for each row affected by the triggering event. If the triggering event affects multiple rows, the trigger body is executed once for each affected row.

In this case, the correct answer is A) Trigger type because it determines the number of times the trigger body executes. The other options are not directly related to determining the number of times the trigger body executes.

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To determine the type of trigger in the given code, let's examine the options:

A. DML trigger - DML triggers are used to execute specific actions before or after data manipulation language (DML) statements, such as INSERT, UPDATE, or DELETE. However, the code provided does not specify any DML statements, so this option is incorrect.

B. Invalid Trigger - This option is correct. The code is incomplete and does not contain any specific logic or actions inside the trigger. Therefore, it is an invalid trigger.

C. Application Trigger - Application triggers are custom triggers that are specifically designed for a particular application. The given code does not provide any information suggesting that it is an application trigger, so this option is incorrect.

D. System Event Trigger - System event triggers are triggered by system-level events, such as system startup or shutdown. The given code does not specify any system events, so this option is incorrect.

Therefore, the correct answer is B. Invalid Trigger. The code provided is incomplete and does not contain any specific logic or actions inside the trigger.

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To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) 1 - This option is correct because the trigger update_emp is fired after an update is performed on the EMP table. The trigger inserts a single row into the AUDIT_TABLE with the value of the user and the current date and time. Since the trigger is fired only once, regardless of the number of rows updated, only one row will be inserted into the AUDIT_TABLE.

Option B) 10 - This option is incorrect because the trigger only inserts one row into the AUDIT_TABLE, regardless of the number of rows updated in the EMP table.

Option C) none - This option is incorrect because the trigger does insert a row into the AUDIT_TABLE after the update on the EMP table.

Option D) Value equal to the number of rows in the EMP table - This option is incorrect because the trigger only inserts one row into the AUDIT_TABLE, regardless of the number of rows in the EMP table.

The correct answer is A) 1. This option is correct because the trigger update_emp inserts a single row into the AUDIT_TABLE regardless of the number of rows updated in the EMP table.

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