add_function

Description:

[ Version ( since = "4.2" ) ]
public SqlBuilderId add_function (string func_name, ...)

Builds a new expression which represents a function applied to some arguments

this	a SqlBuilder object
func_name	the functions's name
...	a list, terminated with `typeof (unichar2)`0, of each function's argument's ID

the ID of the new expression, or typeof (unichar2)0 if there was an error