-- schema version 34 to 33

ALTER TABLE delivery_part ADD COLUMN unloading TEXT DEFAULT NULL;
UPDATE delivery_part SET unloading = 'pumped' WHERE lesewagen;
UPDATE delivery_part SET unloading = 'box' WHERE (SELECT zwstid IN ('H','S') FROM delivery d WHERE (d.year, d.did) = (delivery_part.year, delivery_part.did));
ALTER TABLE delivery_part DROP COLUMN lesewagen;