An Implicit fact
column is used when we have multiple fact tables and the report is generated
only from dimension tables.
A user may create a report where it have only
dimensions and not a single fact measure. when these are created BI server has
multiple join paths available between dimensions and facts so it joins to
nearest fact table and pulls the data hence results obtained might be different
from what user is expecting.To overcome this we can create a Implicit fact
column.This Implicit fact column shows the join path for the BI server.
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