求取10-15条记录的三列的平均值

求取10-15条记录的三列的平均值

是一道面试题，本身不难，突破点是在使用临时表。

USE [tempdb]
GO
 
--DROP TABLE score
CREATE TABLE score(ID INT IDENTITY(1,1) PRIMARY KEY,语文 INT ,数学 int ,英语 int )
GO
 
INSERT INTO score (语文,数学,英语)
SELECT 78,45,67 UNION ALL
SELECT 49,88,67 UNION ALL
SELECT 78,45,45 UNION ALL
SELECT 78,56,67 UNION ALL
SELECT 45,45,44 UNION ALL
SELECT 78,45,67 UNION ALL
SELECT 78,85,67 UNION ALL
SELECT 24,36,43 UNION ALL
SELECT 78,55,67 UNION ALL
SELECT 45,45,63 UNION ALL
SELECT 78,45,96 UNION ALL
SELECT 85,33,84 UNION ALL
SELECT 78,85,67 UNION ALL
SELECT 99,44,39 UNION ALL
SELECT 79,71,82

  解答方法一：(临时表)

SELECT * INTO #TEMP
FROM  score
WHERE ID BETWEEN 10 AND 15
ORDER BY ID ASC

SELECT AVG(语文) as 语文平均成绩,AVG(数学) AS 数学平均成绩,AVG(英语) as 英语平局成绩
FROM #TEMP

  解答方法二：（共用表达式）

WITH CET
AS(
 SELECT * FROM score
 WHERE ID BETWEEN 10 AND 15
 ORDER BY ID ASC
) 
SELECT AVG(语文) as 语文平均成绩,AVG(数学) AS 数学平均成绩,AVG(英语) as 英语平局成绩

FROM CET

 dangran