entity_values.date_start

Date_start is not a primary key in and of itself although it is one quarter of the primary key of the 'entity_values' table along with the entities.entity_id, measures.measure_id, and entity_values.date_end.


This field is used to indicate the start of the date range which the values in the 'entity_valuestable represent.
It is also used to link the values to their footnotes via the 'footnote_values' table.