-- prc_order_bill.receive_weight from upstream TAB_ORDER.WEIGHT
SET NAMES utf8mb4;

SET @col := (
  SELECT COLUMN_NAME FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'prc_order_bill'
    AND COLUMN_NAME = 'receive_weight'
  LIMIT 1
);
SET @sql := IF(
  @col IS NULL,
  'ALTER TABLE prc_order_bill ADD COLUMN receive_weight decimal(10,3) DEFAULT NULL COMMENT ''收货重KG（上游TAB_ORDER.WEIGHT）'' AFTER actual_weight',
  'SELECT 1'
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;