Normally we would not need (Anonymous web server) the section_id in
Normally we would not need the section_id in the reservation table, ………since we can refer to it via the seat_id but the seat_id may be unknown at the time of reservation, so seat assignment can be delayed until the boarding pass is issued. Composite-Key Tables These tables have more than one key because some key segments refer to a code or themed table. table: plane_brand_ model column name sample value *brand_id 1 *id 2 description APM-300 Here, the brand_id and a unique id form the primary keys for the plane model. We want to know to which brand this model refers, and still keep integers for the keys instead of using APM-300 as a key value. table: plane_section column name sample value *airline_id 1 *id 1 description economy Each airline can potentially describe the sections of their planes the way they want some are using hospitality instead of economy. table: airline_brand_model_ restriction column name sample value *airline_id 1 *brand_id 1 *model_id 2 max_number_in_cabin_bags 1 max_number_registered_bags 2 max_weight_registered_bags_kg 50
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