When we should create Date Table?

[brunozanoelo]

Hello guys, 

In one of my PBIX, I have one Star Scheme that have only one DATE column, in this case, I´m using the parameter in PowerBI Desktop which creates one "virtual" date table for each Date column, this PowerBI @GuyInACube video explains: https://www.youtube.com/watch?v=2f7dYB1l84g

In another PBIX, I have an Star Scheme but the main table have MULTIPLES date columns, in this case, should I create one DATE TABLE manually or can I continue using the parameter? Which one is better for performance?

Plus, there´s any explanation why Date and time should be saparated?

@GuyInACube let´s check if you are online 😜

Best Regards,
Bruno

[brunozanoelo]

Hello @HarishKM , thank you for your reply.

I have read this article but what I don´t understand is this:

"However, having a calendar table gives two big advantages:
- It allows you to aggregate data by non-standard columns (think your company’s financial year, or your timesheet weeks, or the Mayan calendar!).

- It gives you access to all of the wonderful time-intelligence functions in DAX, with names like TOTALYTD and CLOSINGBALANCE. Without a calendar table these won’t work."

This is not actually true, since the video that I´ve shared explains that PowerBI do this by itself with the parameter of time intelligence marked as true.

[HarishKM]

@brunozanoelo Hey ,

Kindly read this article . Using a Calendar 

Its good read .