sybase截取小数点的有关问题

sybase截取小数点的问题
当小数点后面是4个0，例如1.0000
怎么把后面的四个0去掉，变成1
只有当小数位后都是4个0的情况，1.0001则不变



------解决方案--------------------------------------------------------
select case when (round(1.0001,4)=1.0001) then floor(1.0001) else round(1.0001,0) end
------解决方案--------------------------------------------------------
select case 
when A>0 then
case A-floor(A)
when 0 then floor(A)
else A
end 
when A<0 then 
case A-ceiling(A)
when 0 then ceiling(A)
else A
end 
from XXXXXXXXXXxx
------解决方案--------------------------------------------------------

探讨

select case when (round(1.0001,4)=1.0001) then floor(1.0001) else round(1.0001,0) end

------解决方案--------------------------------------------------------
select @a = 1.0001
case charindex('[^0]',substring(convert(varchar(4),@a),3,4)) then @a else 
round(@a,0) end