變換排列在SQL

Question

我的表是這樣的：

PC(code, model, speed, ram, hd, cd, price) 

當我運行查詢：

select model,speed,ram,hd,cd,price from PC where code=(select max(code) from PC)我得到的結果如下：

model speed ram hd cd  price 
1233 800  128 20.0 50x 970.0000 

但我需要使用結果unpivot：

chr value 
cd  50x 
hd  20 
model 1233 
price 970.00 
ram  128 
speed 800 

我使用SQL Server 2014

Answer 1

如果您認爲此表和這些測試值：

DECLARE @tbl TABLE(model INT,speed INT,ram INT,hd FLOAT,cd VARCHAR(10),price FLOAT) 
INSERT INTO @tbl 
VALUES 
(1233,800,128,20.0,'50x',970.0000) 

你可以做這樣的事情：

SELECT 
    unpvt.chr, 
    unpvt.value 
FROM 
(
    SELECT 
     CAST(model AS VARCHAR(10)) AS model, 
     CAST(speed AS VARCHAR(10)) AS speed, 
     CAST(ram AS VARCHAR(10)) AS ram, 
     CAST(hd AS VARCHAR(10)) AS hd, 
     cd, 
     CAST(price AS VARCHAR(10)) AS price 
    FROM 
     @tbl AS t 
) AS sourceTable 
UNPIVOT 
(
    value 
    FOR chr IN(model,speed,ram,hd,cd,price) 
) 
AS unpvt 
ORDER BY unpvt.chr 

這將導致該輸出：

chr  value 
--------------- 
cd  50x 
hd  20 
model 1233 
price 970 
ram  128 
speed 800 

你可以在這看到它SQLFIDDLE 。