ALTER TABLE prices_other_products DROP COLUMN IF EXISTS wall_paint_kit_price; -- Add new column to prices_other_products for wall paint kit (with made up prices) ALTER TABLE prices_other_products ADD COLUMN wall_paint_kit_price NUMERIC; UPDATE prices_other_products SET wall_paint_kit_price = wallpaper_kit_price; -- Set paint kit price to the same as wallpaper kit price for now ALTER TABLE prices_other_products ALTER COLUMN wall_paint_kit_price SET NOT NULL; ALTER TABLE prices_other_products ADD CONSTRAINT valid_wall_paint_kit_price CHECK (prices_other_products.wall_paint_kit_price > 0);