The third way to calculate today's date is by using an attribute hierarchy. This is potentially the best way.
Instead of all the complexity with sets, strings, and other things in the previous two recipes, here we simply add a new column to the
Date table and have the ETL maintain a flag for today's date. Then we slice by that attribute instead of using the
Now() function in MDX. Plus, we don't have to wait to switch to "tomorrow" in MDX queries until the ETL completes and the cube is processed.
Open the Adventure Works DW 2008 solution in BIDS. Double-click the Adventure Works DW data source view. Locate the Date dimension in the left Tables pane and click on it.