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LennyGrayFlag for United States of America

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SQL using a string table field as a formula to calculate results in decimal form

I have a table which contains a data field which is in VARCHAR format that contains a formula. I would like to convert that formula into a decimal value in a new data field.

This is what one of the fields looks like:

CommonPrograms.dbo.cp_GreaterUDF(.05,(CommonPrograms.dbo.cp_GreaterUDF(.0225,225*.01) + 125*.01)) + 4.5

"CommonPrograms.dbo.cp_GreaterUDF" is a user-defined function that calculates the greater of two numbers. But there could be anything in that field. For example: the data field could contain: 2+3+6*100

Could you please send me code that will convert the VARCHAR field into a decimal data field which will now reflect the results of the formula?


Avatar of Guy Hengel [angelIII / a3]
Guy Hengel [angelIII / a3]
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Try casting :

CAST (DataField AS DECIMAL (3, 2))
something like this may work
declare @CustId int32
  declare @Formula nvarchar(1000)
  declare @sql nvarchar(4000)
	declare CustList cursor for
	select custid, formula from myTable where ...

	OPEN CustList
	FETCH NEXT FROM CustList INTO @CustId, @Formula

	  set @sql='update myTable set colX=' + @formula +' where CustID=' + @CustID;
	  exec @sql;
	  FETCH NEXT FROM CustList INTO @CustId, @Formula

	CLOSE CustList

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