[SQL]UNPIVOT 多個欄位

先準備測試資料如下，

01

create table T ( 

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no varchar(10), 

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yearx varchar(4), 

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z_type varchar(1), 

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A01 smallint, 

06

B01 smallint, 

07

A02 smallint, 

08

B02 smallint, 

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A03 smallint, 

10

B03 smallint

11
) 

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go 

13

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insert into T VALUES('Z01','2012','1',100,-10,200,30,50,60); 

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insert into T VALUES('Z01','2012','3',200,20,100,20,30,40); 

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insert into T VALUES('Z01','2013','3',300,30,10,50,70,30); 

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SELECT * FROM T;

因為原本欄位A01, A02, A03要放到欄位A，B01, B02, B03要放到欄位B，所以需要2個UNPIVOT，如下，

1

SELECT no, yearx, z_type, A, B, x1, x2  

2

FROM 

3

   (SELECT * 

4

   FROM T) p 

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UNPIVOT ( A FOR x1 IN (A01, A02, A03) )AS UnA 

6

UNPIVOT ( B FOR x2 IN (B01, B02, B03) )AS UnB

上面的輸出筆數為27筆，而我們可以發現，x1, x2欄位中，A01 搭配 B01，A02 要搭配 B02，A03 要搭配 B03，如下圖所示，

所以我們需要再加入關鍵的 WHERE 條件， RIGHT(x1, 1) = RIGHT(x2, 1)，就可以過濾出我們所需要的資料，如下，

1

SELECT no, yearx, z_type, A, B, x1, x2  

2

FROM 

3

   (SELECT * 

4

   FROM T) p 

5

UNPIVOT ( A FOR x1 IN (A01, A02, A03) )AS UnA 

6

UNPIVOT ( B FOR x2 IN (B01, B02, B03) )AS UnB 

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WHERE RIGHT(x1, 1) = RIGHT(x2, 1)

如果要加上序號的話，就加入 ROW_NUMBER 就可以了，如下，

01

SELECT * 

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, ROW_NUMBER() OVER(PARTITION BY no, yearx, z_type ORDER BY  no, yearx, z_type) AS SEQX 

03
FROM

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( 

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SELECT no, yearx, z_type, A, B, x1, x2  

06

FROM 

07

   (SELECT * 

08

   FROM T) p 

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UNPIVOT ( A FOR x1 IN (A01, A02, A03) )AS UnA 

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UNPIVOT ( B FOR x2 IN (B01, B02, B03) )AS UnB 

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WHERE RIGHT(x1, 1) = RIGHT(x2, 1) 

12
) T2