Convert to valid decimal data type

问题:

I have a column [Cash] nvarchar(50) that has data that will later be converted to decimal(9,3) during an import process,some of the data is consistent with normal looking numeric values such as 134.630,-80.662 and 324.372. Occasionally I have data with multiple dots for the numeric values such as 1.324.372 and -2.134.630. Is there a way of removing this extra dot.

回答1:

declare @yourtable table(cash varchar(20)) insert @yourtable values('1.324.372') insert @yourtable values('-2.134.630') insert @yourtable values('1.234.567.89') 

Old Code:

select reverse(replace(replace(stuff(reverse(cash), charindex(     '.', reverse(cash)), 1, ','), '.', ''), ',', '.'))  from @yourtable 

Slightly upgraded code(result is the same):

select reverse(stuff(reverse(replace(cash, '.', '')),      charindex('.', reverse(cash)), 1, '.')) from @yourtable 

Result:

1324.372 -2134.630 1234567.89 

回答2:

You could;

select case when len(cash) - len(replace(cash, '.', '')) > 1 then     reverse(stuff(reverse(cash), charindex('.', reverse(cash)), 1, '')) else         cash end from T 

回答3:

Create a view that includes a calculated field with the proper value.

That way you can still see the varchar value and the corresponding decimal value.

Something like this:

select [Cash], cast(replace([Cash],'.','') as decimal) as [CashDecimal]
from ....

文章来源: Convert to valid decimal data type