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

Option A) True - This option is incorrect because the OR operator displays a record if at least one of the conditions listed is true, not any condition.

Option B) False - This option is correct because the AND operator displays a record only if all of the conditions listed are true.

The correct answer is B) False. This option is correct because the statement correctly explains the behavior of the AND operator, but not the OR operator. The OR operator displays a record if at least one of the conditions listed is true, not any condition.

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• Wrong explanation

To return all the records from a table named "Persons" sorted descending by "FirstName" in SQL, you can use the "ORDER BY" clause.

Let's go through each option to understand why it is correct or incorrect:

Option A) SELECT * FROM Persons SORT BY 'FirstName' DESC - This option is incorrect because the correct keyword to sort in SQL is "ORDER BY" and not "SORT BY".

Option B) SELECT * FROM Persons SORT 'FirstName' DESC - This option is incorrect because the correct keyword to sort in SQL is "ORDER BY" and not "SORT". Additionally, the syntax for specifying the column to sort by should not be enclosed in single quotes ('FirstName').

Option C) SELECT * FROM Persons ORDER BY FirstName DESC - This option is correct. It uses the "ORDER BY" clause to sort the records in descending order based on the "FirstName" column.

Option D) SELECT * FROM Persons ORDER FirstName DESC - This option is incorrect because the correct syntax to specify the column to sort by is "ORDER BY" followed by the column name. Here, the "FirstName" column is missing the "BY" keyword.

The correct answer is C. This option is correct because it uses the "ORDER BY" clause with the correct syntax to sort the records in descending order by the "FirstName" column.

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• Wrong explanation

To insert the value "Olsen" as the "LastName" in the "Persons" table using SQL, you can use the following statement:

A. INSERT INTO Persons (LastName) VALUES ('Olsen')

Explanation: Option A is the correct answer because it follows the correct syntax for the INSERT statement in SQL. The statement starts with "INSERT INTO" followed by the table name "Persons". Then, in parentheses, you specify the column name "LastName" where you want to insert the value. Finally, the keyword "VALUES" is used to specify the value you want to insert, which is 'Olsen' in this case.

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• Wrong explanation

To select all the records from a table named "Persons" where the "FirstName" is "Peter" and the "LastName" is "Jackson", you would use the SQL query:

A. SELECT * FROM Persons WHERE FirstName='Peter' AND LastName='Jackson'

Explanation: Option A) SELECT * FROM Persons WHERE FirstName='Peter' AND LastName='Jackson' - This option is correct because it uses the "SELECT" statement to retrieve all columns ("*") from the "Persons" table where the "FirstName" is equal to "Peter" and the "LastName" is equal to "Jackson".

Option B) SELECT FirstName='Peter', LastName='Jackson' FROM Persons - This option is incorrect because it uses the "SELECT" statement incorrectly. The column names should be specified after the "SELECT" keyword, not the values.

Option C) SELECT * FROM Persons WHERE FirstName<>'Peter' AND LastName<>'Jackson' - This option is incorrect because it uses the "NOT EQUAL TO" operator "<>" instead of the "EQUAL TO" operator "=" to filter the records by "FirstName" and "LastName".

Option D) SELECT * FROM Persons WHERE FirstName='Jackson' AND LastName='Peter' - This option is incorrect because it swaps the values for "FirstName" and "LastName" in the query. The correct query should be "FirstName='Peter' AND LastName='Jackson'".

Therefore, the correct answer is A) SELECT * FROM Persons WHERE FirstName='Peter' AND LastName='Jackson'.

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• Wrong explanation