measure_groups.measure_group_id
Measure_group_id is the primary key for the 'measure_groups' table.
This key is used to link records in the 'measure_group_measures' table to the set of measure_ids that the measure group ID represents.
Measure_group_id is the primary key for the 'measure_groups' table.
This key is used to link records in the 'measure_group_measures' table to the set of measure_ids that the measure group ID represents.