SQL Server rounding Error, Giving different values

Question

I have a Stored Procedure that does a lots of calculation, stores the results in several temporary table. Finally calculating the sum and rounding to two decimal and stores

Answer 1

This is because you are using float database type.

Float should not be used to represent values that require precision, since they are stored as approximations, different manipulations can give you different results.

In sql server you can use decimal and numeric data types for numerical precision: http://msdn.microsoft.com/en-us/library/ms187746.aspx