For time intelligence in SSAS Tabular models, it’s important to mark a date table. So, how do you do that?
Here are the steps:
1. After you have the data imported in a table, in the model designer, select the date table
2. Also, make sure that necessary relationships are created between date table and fact tables.
3. Now, on the menu bar, select Table > Date > Mark as Date Table
4. A dialog box should ask you for a unique identifier of the date table, so it could be a date column which has the unique columns for the date table that you imported.
Also, make sure that the unique identifier does not have blank values because the model designer will not allow you to select it as your unique identifier and so you may have to go back to your table properties and put a logic to filter out blank values or make sure that the a row with blank value has a value assigned to it.
After you do that, you’re all set to go! I hope this helps.