This figure illustrates a rollup for a dimension with two hierarchies. In it:

- year: is at the top of the dimension hierarchy

- quarter: is below year

- month: is below quarter

- day: is at the bottom of the dimension hierarchy

In addition, there is a second rollup. In it:

- fis_year: is at the top of the dimension hierarchy

- fis_quarter: is below fis_year

- fis_month: is below fis_quarter

- fis_week: is below fis_month

- dat: is at the bottom of the dimension hierarchy

Therefore, day rolls up both hierarchies.