--類型轉換
declare @T table ( Num float ( 38)) --float/real 轉換為字符
insert @T select 1230
union all select 1234
union all select 123.45
union all select 123.456
union all select 123.4567
union all select 123.45678
select *, rtrim ( Num) as [ 直接轉換為字符 ] from @T
/*
Num 直接轉換為字符
---------------------- -----------------------
1230 1230
1234 1234
123.45 123.45
123.456 123.456
123.4567 123.457 -- 有誤
123.45678 123.457 -- 有誤
*/
select
[ 轉換為字符 ]= case when len ( Num)= charindex ( '.' , Num) then stuff ( Num, len ( Num), 1, '' ) else Num end
from
(
select
Num=left( Num, Len ( Num)- patindex ( '%[^0]%' , reverse ( Num))+ 1)
from (
select rtrim ( cast ( Num as decimal ( 38, 10))) as Num from @T
) T
) T2
/*
轉換為字符
--------------------
1230
1234
123.45
123.456
123.4567
123.45678
*/