Case Condition中的条件

Question

select min(measurement), part_desc 
    (case len(measurement) 
     when 6 then '0000' + part_desc 
     else '000' + part_desc 
     end) 
from LeachingView 
where DateTimeStamp > '2011-01-01' and measurement > 0 
group by measurement, part_desc 

这是假设将0000附加到另一个字符的前面，但它不起作用，我想知道为什么以及如何使其正确。

我得到的错误是这样的：

“part_desc”是无法识别的内置函数名称。

Answer 1

并不真的需要一个CASE在所有...

select 
    min(measurement), 
    RIGHT('0000000000' + part_desc, 10) AS part_desc 
from... 

Answer 2

select min(measurement), 
    case len(measurement) 
     when 6 then '0000' + part_desc 
     else '000' + part_desc 
    end as part_desc 
from LeachingView 
where DateTimeStamp > '2011-01-01' 
    and measurement > 0       
group by case len(measurement) 
     when 6 then '0000' + part_desc 
     else '000' + part_desc 
    end 

Answer 3

我想你想

Select min(measurment), 
     (case len(measurement) 
     when 6 then '0000' + part_desc 
     else '000' + part_desc 
     end) AS "part_desc" 
From LeachingView 
Where...