[英]Is there a way to achieve below using pivot or something else in T-SQL?
[英]SQL Pivot or something else?
我有一个预先存在的表(因此我无法更改此表),如下所示:
Company GLSeg1 GLSeg2 GLSeg3
XXX 00003 NULL 00001
YYY 00002 00004 NULL
我想创建一个这样的临时表,仅选择一家公司:
查询XXX时,表格应如下所示:
GLSeg Value
1 00003
2 NULL
3 00001
查询YYY时,表应如下所示:
GLSeg Value
1 00002
2 00004
3 NULL
我已经看过pivot
功能,但是没有看到根据需要创建临时表的方法。
使用cross apply(values ..)
取消数据透视:
select t.Company, v.GLSeg, v.Value
from t
cross apply (values
(1,glseg1),(2,glseg2),(3,glseg3)
) v (GLSeg,Value)
extrester演示: http ://rextester.com/ZKTD58113
返回:
+---------+-------+-------+
| Company | GLSeg | Value |
+---------+-------+-------+
| xxx | 1 | 00003 |
| xxx | 2 | NULL |
| xxx | 3 | 00001 |
| yyy | 1 | 00002 |
| yyy | 2 | 00004 |
| yyy | 3 | NULL |
+---------+-------+-------+
对于仅一家公司:
select v.GLSeg, v.Value
from t
cross apply (values
(1,glseg1),(2,glseg2),(3,glseg3)
) v (GLSeg,Value)
where t.company = 'xxx'
返回:
+-------+-------+
| GLSeg | Value |
+-------+-------+
| 1 | 00003 |
| 2 | NULL |
| 3 | 00001 |
+-------+-------+
结合使用UNPIVOT和COALESCE:
SELECT COMPANY
, STUFF(SUBJECT,1,5,'') AS GLSEG
, CASE WHEN VALUE ='<NULL>' THEN NULL ELSE VALUE END AS VALUE
FROM (SELECT COMPANY
, COALESCE( GLSEG1,'<NULL>') AS GLSEG1
, COALESCE( GLSEG2,'<NULL>') AS GLSEG2
, COALESCE( GLSEG3,'<NULL>') AS GLSEG3
FROM SEG_COMP ) A
UNPIVOT(VALUE FOR SUBJECT IN (GLSEG1, GLSEG2,GLSEG3) ) U
WHERE COMPANY='XXX'
输出:
COMPANY GLSEG VALUE
XXX 1 00003
XXX 2 NULL
XXX 3 00001
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