ALTER TABLE buildings DROP COLUMN IF EXISTS location_address_source;
ALTER TABLE buildings DROP COLUMN IF EXISTS location_address_links;
ALTER TABLE buildings DROP COLUMN IF EXISTS location_coordinates_source;
ALTER TABLE buildings DROP COLUMN IF EXISTS location_coordinates_links;
ALTER TABLE buildings DROP COLUMN IF EXISTS is_domestic_source;
ALTER TABLE buildings DROP COLUMN IF EXISTS is_domestic_links;
ALTER TABLE buildings DROP COLUMN IF EXISTS size_storeys_source_type;
ALTER TABLE buildings DROP COLUMN IF EXISTS size_storeys_source_links;
ALTER TABLE buildings DROP COLUMN IF EXISTS size_height_apex_source_type; 
ALTER TABLE buildings DROP COLUMN IF EXISTS size_height_apex_source_links;
ALTER TABLE buildings DROP COLUMN IF EXISTS size_height_eaves_source_type;
ALTER TABLE buildings DROP COLUMN IF EXISTS size_height_eaves_source_links;
ALTER TABLE buildings DROP COLUMN IF EXISTS size_height_eaves;
ALTER TABLE buildings DROP COLUMN IF EXISTS size_width_frontage_source_type;
ALTER TABLE buildings DROP COLUMN IF EXISTS size_width_frontage_source_links;
ALTER TABLE buildings DROP COLUMN IF EXISTS survival_source_links;
ALTER TABLE buildings DROP COLUMN IF EXISTS landowner_source_type;
ALTER TABLE buildings DROP COLUMN IF EXISTS designers_source_type;
ALTER TABLE buildings DROP COLUMN IF EXISTS builder_source_type;
ALTER TABLE buildings DROP COLUMN IF EXISTS extension_source_type;
ALTER TABLE buildings DROP COLUMN IF EXISTS extension_source_links;