Performance operations based on Column values in SQL server 2008

Question

Hi ,
I have a table which consist of following columns
ID    Formula              
Values                 
DisplayValue
1                    
a*b/100       100*12/100    
      null
2                    
b*c/100       
12*4/100              
null
I want to perform operation based on column "Values" and save data after operations in new column Name "Display Value" .i.e I want to get the below result . Can anyone please help.
ID    Formula              
Values                 
DisplayValue
1                    
a*b/100       100*12/100    
      12
2                    
b*c/100       
12*4/100             
0.48
Thanks for the help.
Regards, Priti A

Answer 1

Try this,
create table #mytable (ID int,Formula varchar(10), [Values] varchar(10), DisplayValue decimal(10,4))
insert into #mytable values(1 ,'a*b/100','100*12/100',null)
insert into #mytable values(2 ,'b*c/100','12*4/100',null)
declare @rowcount int=1
while @rowcount <= (select max(id) from #mytable)
begin
declare @expression nvarchar(max)
select @expression=[values] from #mytable where id = + @rowcount
declare @sql nvarchar(max)
set @sql = 'select @result = ' + @expression
declare @result decimal(10,4)
exec sp_executesql @sql, N'@result decimal(10,4) output', @result = @result out
update #mytable set DisplayValue= @result where id = @rowcount
set @rowcount=@rowcount+1
end
select * from #mytable
Regards, RSingh