篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了sql MS SQL CTE相关的知识，希望对你有一定的参考价值。
-- Example 1
-- CTE Name and Column List
WITH Sales_CTE (SalesPersonID,SalesOrderID, SalesYear)
AS
-- CTE Query
(
SELECT SalesPersonID,
SalesOrderID,
YEAR(OrderDate) As SalesYear
FROM Sales.SalesOrderHeader
WHERE SalesPersonID IS NOT NULL
)
-- Outer Query
SELECT SC.SalesPersonID,
COUNT(SC.SalesOrderID) AS TotalSales,
SC.SalesYear
FROM Sales_CTE AS SC
GROUP BY SC.SalesYear,SC.SalesPersonID
ORDER BY SC.SalesPersonID, SC.SalesYear;
-- Example 2
WITH Sales_CTE (SalesPersonID, NumberOfOrders)
AS
(
SELECT SalesPersonID, COUNT(*)
FROM Sales.SalesOrderHeader
WHERE SalesPersonID IS NOT NULL
GROUP BY SalesPersonID
)
SELECT AVG(NumberOfOrders) AS "Average Sales Per Person"
FROM Sales_CTE;