-- 收货单明细新增 lot 编号（达梦）
DECLARE
v_count INT;
BEGIN
SELECT COUNT(1)
INTO v_count
FROM USER_TAB_COLUMNS
WHERE TABLE_NAME = 'RECEIPT_MATERIAL_DETAIL'
  AND COLUMN_NAME = 'LOT_NO';

IF v_count = 0 THEN
        EXECUTE IMMEDIATE 'ALTER TABLE RECEIPT_MATERIAL_DETAIL ADD (LOT_NO VARCHAR2(255))';
EXECUTE IMMEDIATE 'COMMENT ON COLUMN RECEIPT_MATERIAL_DETAIL.LOT_NO IS ''lot编号''';
END IF;
END;
/