列在sql中的行

Question

我想在sql请求帮助，我有一个表格

ID    | Indicator1 | Indicator2 | Indicator3 | Indicator4
1     | 1          | 0          | 0          | 0
2     | 0          | 1          | 1          | 0
3     | 1          | 1          | 0          | 0
4     | 0          | 0          | 0          | 0

我想让它看起来像这样

ID    | Indicators
1     | Indicator1
2     | Indicator2
2     | Indicator3
3     | Indicator1
3     | Indicator2
4     | NULL

有什么建议吗？谢谢

Answer 1

使用UNPIVOT。

SELECT p.Id,
   p.Indicators,
   p.IndicatorsValue 
FROM TableName
UNPIVOT
(
    IndicatorsValue FOR Indicators IN (Indicator1,Indicator2,Indicator3,Indicator4) 
)AS p

Answer 2

select   b.* from #temp a left join (
SELECT p.Id,
   p.Indicators
FROM #temp
UNPIVOT
(
    IndicatorsValue FOR Indicators IN (Indicator1,Indicator2,Indicator3,Indicator4) 
)AS p
where p.IndicatorsValue <>0)b on a.id=b.id

Answer 3

使用UNPIVOT并添加过滤器以删除不必要的列：

SELECT  DISTINCT ID, Indicators
FROM #Indicator
UNPIVOT (IndicatorsValue
FOR Indicators IN (Indicator1,Indicator2,Indicator3,Indicator4)) AS up
WHERE up.IndicatorsValue <> 0