-- Launch of Constuction category
-- Fields: Core construction material, Secondary construction materials, Roof covering materials

-- Construction materials: Wood, Stone, Brick, Steel, Reinforced Concrete, Other Metal
--   Other Natural Material, Other Man-Made Material
CREATE TYPE construction_materials
    AS ENUM ('Wood',
    'Stone',
    'Brick',
    'Steel',
    'Reinforced Concrete',
    'Other Metal',
    'Other Natural Material',
    'Other Man-Made Material');

-- Roof covering materials: Slate, Clay Tile, Wood, Asphalt, Iron or Steel, Other Metal
--   Other Natural Material, Other Man-Made Material
CREATE TYPE roof_covering
    AS ENUM ('Slate',
    'Clay Tile',
    'Wood',
    'Asphalt',
    'Iron or Steel',
    'Other Metal',
    'Other Natural Material',
    'Other Man-Made Material');

-- Core Construction Material
ALTER TABLE buildings
    ADD COLUMN IF NOT EXISTS core_materials construction_materials;

-- Secondary Construction Materials
ALTER TABLE buildings
    ADD COLUMN IF NOT EXISTS secondary_materials construction_materials;

-- Main Roof Covering 
ALTER TABLE buildings
    ADD COLUMN IF NOT EXISTS roof_covering roof_covering;