Question

select 
    'N' as Content,  
    (select COUNT(*)  from TB1  ) as [Sample Analyzed ],  
    (select COUNT(*)  from TB1  where convert(float,D) between 0.0005 and 0.75) as [Very Low],  
    (select COUNT(*)  from TB1  where convert(float,D) between 0.76 and 1.25 ) as [Low] 
union  
    select 'P' as Content,  
    (select COUNT(*)  from TB1  ) as [Sample Analyzed ],  
    (select COUNT(*)  from TB1  where convert(float,C) between 0.0005 and 0.75) as [Very Low],  
    (select COUNT(*)  from TB1  where convert(float,C) between 0.76 and 1.25 ) as [Low] 
union  
    select 'K' as Content,  
    (select COUNT(*)  from TB1  ) as [Sample Analyzed ],
    (select COUNT(*)  from TB1  where convert(float,B) between 0.0005 and 0.75) as [Very Low],  
    (select COUNT(*)  from TB1  where convert(float,B) between 0.76 and 1.25 ) as [Low] 
union  
    select 'OC' as Content,  
    (select COUNT(*)  from TB1  ) as [Sample Analyzed ],  
    (select COUNT(*)  from TB1  where convert(float,A) between 0.0005 and 0.75) as [Very Low],  
    (select COUNT(*)  from TB1  where convert(float,A) between 0.76 and 1.25 ) as [Low]
ORDER BY
    (
     CASE 
       WHEN  Content = 'N' THEN 0
       WHEN  Content = 'P' THEN 1
       WHEN  Content = 'K' THEN 2
       WHEN  Content = 'OC' THEN 3
       ELSE 4
     END
    )

Answer 1

...列名'内容'无效....

那是因为您无法在ORDER BY

中使用列别名

如果语句，ORDER BY项必须出现在选择列表中包含UNION，INTERSECT或EXCEPT运算符

那是因为列别名不是select的一部分，与上面相同。它不是一个实际的列（还）

以下是将其包装在CTE。

中的示例

with cte as(
select 
    'N' as Content,  
    (select COUNT(*)  from TB1  ) as [Sample Analyzed ],  
    (select COUNT(*)  from TB1  where convert(float,D) between 0.0005 and 0.75) as [Very Low],  
    (select COUNT(*)  from TB1  where convert(float,D) between 0.76 and 1.25 ) as [Low] 
union  
    select 'P' as Content,  
    (select COUNT(*)  from TB1  ) as [Sample Analyzed ],  
    (select COUNT(*)  from TB1  where convert(float,C) between 0.0005 and 0.75) as [Very Low],  
    (select COUNT(*)  from TB1  where convert(float,C) between 0.76 and 1.25 ) as [Low] 
union  
    select 'K' as Content,  
    (select COUNT(*)  from TB1  ) as [Sample Analyzed ],
    (select COUNT(*)  from TB1  where convert(float,B) between 0.0005 and 0.75) as [Very Low],  
    (select COUNT(*)  from TB1  where convert(float,B) between 0.76 and 1.25 ) as [Low] 
union  
    select 'OC' as Content,  
    (select COUNT(*)  from TB1  ) as [Sample Analyzed ],  
    (select COUNT(*)  from TB1  where convert(float,A) between 0.0005 and 0.75) as [Very Low],  
    (select COUNT(*)  from TB1  where convert(float,A) between 0.76 and 1.25 ) as [Low]
)

select * from cte 
ORDER BY
    (
     CASE 
       WHEN  Content = 'N' THEN 0
       WHEN  Content = 'P' THEN 1
       WHEN  Content = 'K' THEN 2
       WHEN  Content = 'OC' THEN 3
       ELSE 4
     END
    )

为什么我的后续SQL查询不起作用

1 个答案: