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You need to implement a common table expression (CTE). Which code segment should you use?None of the aboveCREATE VIEW SalesByYearASSELECT Year,Region,SUM(OrderTotal)FROM OrdersGROUP BY Year, Region;GOSELECT Year, Region, Total FROM SalesByYear;;WITH SalesByYear (Year,Region,Total)AS(SELECT Year,Region,SUM(OrderTotal)FROM OrdersGROUP BY Year,Region)SELECT Year,Region,Total FROM SalesByYear;SELECT Year,Region,TotalFROM(SELECT Year,Region,SUM(OrderTotal) AS TotalFROM OrdersGROUP BY Year, Region) AS [SalesByYear];

Question

You need to implement a common table expression (CTE). Which code segment should you use?None of the aboveCREATE VIEW SalesByYearASSELECT Year,Region,SUM(OrderTotal)FROM OrdersGROUP BY Year, Region;GOSELECT Year, Region, Total FROM SalesByYear;;WITH SalesByYear (Year,Region,Total)AS(SELECT Year,Region,SUM(OrderTotal)FROM OrdersGROUP BY Year,Region)SELECT Year,Region,Total FROM SalesByYear;SELECT Year,Region,TotalFROM(SELECT Year,Region,SUM(OrderTotal) AS TotalFROM OrdersGROUP BY Year, Region) AS [SalesByYear];

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Solution

The correct code segment to implement a common table expression (CTE) is:

WITH SalesByYear (Year,Region,Total)
AS
(
SELECT Year,Region,SUM(OrderTotal)
FROM Orders
GROUP BY Year,Region
)
SELECT Year,Region,Total FROM SalesByYear;

Here's a step-by-step explanation:

  1. The WITH keyword is used to begin the CTE. This is followed by the name of the CTE (SalesByYear) and the names of the columns it will contain (Year, Region, Total).

  2. The AS keyword is used to define the CTE. This is followed by the query that generates the data for the CTE. In this case, it's a SELECT statement that groups the Orders table by Year and Region and calculates the sum of OrderTotal for each group.

  3. After the CTE is defined, it can be used like a regular table in a SELECT statement. This SELECT statement retrieves all columns from the SalesByYear CTE.

This problem has been solved

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