Here is an example of creating and using a temporary table in SQL Server:

— Create a temporary table CREATE TABLE #Employees ( EmployeeID INT, FirstName VARCHAR(50), LastName VARCHAR(50), Salary INT )

— Insert data into the temporary table INSERT INTO #Employees VALUES (1, ‘John’, ‘Doe’, 50000), (2, ‘Jane’, ‘Smith’, 55000), (3, ‘Mark’, ‘Johnson’, 60000)

— Select data from the temporary table SELECT * FROM #Employees

— The result will be: — EmployeeID FirstName LastName Salary — 1 John Doe 50000 — 2 Jane Smith 55000 — 3 Mark Johnson 60000

Note that once the connection is closed or the user session ends, the temporary table will be automatically dropped. To explicitly drop the temporary table, you can use the DROP TABLE statement.

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Here is an example of a subquery in SQL Server:

SELECT FirstName, LastName, Salary
FROM Employees
WHERE Salary >= (SELECT AVG(Salary) 
                 FROM Employees)

In this example, the subquery SELECT AVG(Salary) FROM Employees retrieves the average salary of all employees. The main query SELECT FirstName, LastName, Salary FROM Employees WHERE Salary >= (SELECT AVG(Salary) FROM Employees) then retrieves the first name, last name, and salary of all employees who have a salary greater than or equal to the average salary retrieved from the subquery.

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In SQL Server, the difference between nvarchar and ntext data types is their maximum storage capacity and their usage.

nvarchar is a variable-length, Unicode data type that can store up to 4,000 characters.
ntext is a variable-length, Unicode data type that can store large amounts of text data, up to 2^30-1 characters (1 GB).
The nvarchar data type is generally used for storing smaller amounts of text data, such as names, addresses, and descriptions. The ntext data type is typically used for storing large amounts of text data, such as articles, blog posts, and product descriptions.

It’s worth noting that ntext is no longer recommended for use, instead varchar(max) and nvarchar(max) is preferable.

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