description User-defined functions accept parameters, perform an action, such as a complex calculation, and return the result of that action as a value. A user-defined function is a [!INCLUDE tsql] ...

SQLConnect establishes connections to a driver and a data source. The connection handle references storage of all information about the connection to the data source ...

operand is one of the following: constant is a number or a quoted character string (or other special notation) that indicates a fixed value. Constants are also called literals. Constants are described ...