There is no formula engine in Seal Report.
This is because you should rely mainly on your database engine to perform specific calculations.

However, it is easy to change the SQL used to query your column and thus add SQL formula in your model:

Create a model, based on Northwind
Drag and drop the Product Name in the Row Elements of the model.
Then go in Advanced->Custom SQL, you can here customize the SQL with what you want (call of a function, case statements, etc.)
For Northwind, just type to add a prefix to your column value.

You can also use this property for the Data elements.
Drag and drop Quantity in the Data Elements
Rename it to Total Price
Then in Custom SQL, type
this will give the calculation of the price.

You can also customize the CSS style of your cell in the Custom Cell CSS property.
Just type ¨

So when you run the report, you got the list of product with a total price based (in red !) on a calculation performed by the database server.

Do not hesitate to use the CASE statements in SQL Server or Oracle, they can be very useful.

Edited by user Tuesday, March 11, 2014 12:42:00 PM(UTC)  | Reason: Not specified