TSQL枢轴多列

Question

我有下面的表格，但不确定是否有可能转动它并保留所有标签。

RATIO    RESULT SCORE GRADE 
Current Ratio  1.294 60  Good 
Gearing Ratio  0.3384 70  Good 
Performance Ratio 0.0427 50  Satisfactory 
TOTAL    NULL 180  Good 

我会承认自己不是很好的使用枢轴，所以导致这个输出经过几次尝试：

SELECT 'RESULT' AS 'Ratio' 
    ,[Current Ratio] AS 'Current Ratio' 
    ,[Gearing Ratio] AS 'Gearing Ratio' 
    ,[Performance Ratio] AS 'Performance Ratio' 
    ,[TOTAL] AS 'TOTAL' 
FROM 
(
    SELECT RATIO, RESULT 
    FROM GRAND_TOTALS 
) AS SREC 
PIVOT 
(
    MAX(RESULT) 
    FOR RATIO IN ([Current Ratio],[Gearing Ratio], [Performance Ratio], [TOTAL]) 
) AS PVT 

这给出结果：

Ratio Current Ratio Gearing Ratio Performance Ratio 
Result 1.294  0.3384  0.0427 

我会承认感到非常难以接受下一步做什么以产生我需要的结果：

Ratio Current Ratio Gearing Ratio Performance Ratio TOTAL 
Result  1.294  0.3384    0.0427   NULL 
Score  60    70    50    180 
Grade  Good   Good   Satisfactory   Good 

Answer 1

由于您要旋转多列数据，因此我会首先建议您将不透明的列设置为result,score和grade，以便您没有多列，但是将有多行。

根据您的SQL Server版本，您可以使用UNPIVOT函数或CROSS APPLY。未反转数据的语法将类似于：

select ratio, col, value 
from GRAND_TOTALS 
cross apply 
(
    select 'result', cast(result as varchar(10)) union all 
    select 'score', cast(score as varchar(10)) union all 
    select 'grade', grade 
) c(col, value) 

请参阅SQL Fiddle with Demo。一旦数据已经unpivot操作，那么您可以将旋转功能：

select ratio = col, 
    [current ratio], [gearing ratio], [performance ratio], total 
from 
(
    select ratio, col, value 
    from GRAND_TOTALS 
    cross apply 
    (
    select 'result', cast(result as varchar(10)) union all 
    select 'score', cast(score as varchar(10)) union all 
    select 'grade', grade 
) c(col, value) 
) d 
pivot 
(
    max(value) 
    for ratio in ([current ratio], [gearing ratio], [performance ratio], total) 
) piv; 

见SQL Fiddle with Demo。这会给你结果：

| RATIO | CURRENT RATIO | GEARING RATIO | PERFORMANCE RATIO |  TOTAL | 
|--------|---------------|---------------|-------------------|-----------| 
| grade |   Good |   Good |  Satisfactory |  Good | 
| result |  1.29400 |  0.33840 |   0.04270 | (null) | 
| score |  60.00000 |  70.00000 |   50.00000 | 180.00000 |