摘要: 1. 查询空值 条件为’’ 是查不出结果的。 如果要查,应该使用 is not null 来查。 QUESTION NO: 135 View the Exhibit and examine the data in the PRODUCTS table. You need to display product names from the PRODUCTS table that belong... 阅读全文
posted @ 2014-06-26 18:49 hmilyjch 阅读(135) 评论(0) 推荐(0) 编辑