Is creating calculations in the Data Source View the right place to add a calculation?, assignment help

1) Is creating calculations in the Data Source View the right place to add a calculation? Does adding the calculation here prevent the end user from drill through the SSAS cube to detail?2) Where else might a developer add calculations?3) Does SSAS use a two-tier Architecture?Note : use a reference as a source for your work products, you must use the APA in-text citation format to credit the author.