问题
单项选择题
关系型数据库中所谓的“关系”是指______。
A．各个记录中的数据彼此间有一定的关联关系
B．数据模型符合满足一定条件的二维表格式
C．某两个数据库文件之间有一定的关系
D．表中的两个字段有一定的关系
答案
参考答案：B
解析：[讲解] Access中，一个表就是一个关系，每一个关系都是一个二维表。
搜题请搜索小程序“爱下问搜题”
关系型数据库中所谓的“关系”是指______。
A．各个记录中的数据彼此间有一定的关联关系
B．数据模型符合满足一定条件的二维表格式
C．某两个数据库文件之间有一定的关系
D．表中的两个字段有一定的关系
参考答案：B
解析：[讲解] Access中，一个表就是一个关系，每一个关系都是一个二维表。
Bill, a thirteen-year-old boy, thought he had grown up to be a man. But his parents told him, “ You won’t be a real man until you begin to_1_____ helping others.” One morning, his parents gave him some money to 2____ some milk for them. Outside a shop he saw a homeless old man who looked very 3____. Bill went to him and asked, “ What’s wrong with you?” The old man answered, “ I’m hungry. I haven’t had any food for two days.” All the thought of his parents’ words, Bill said to the old man, “Let’s go to the 4_______.” When they got there, Bill asked the waiter to bring out bread and coffee to the old man. The old man finished the meal quickly. After the waiter 5_____the plate and the cup, the old man said, “Sorry for give you too much6_____. I’m fine now. I’ll 7____ forget your kindness! You are a very good young man” Bill was 8______ when he heard this. Just when he wanted to pay for the meal, the waiter came. Bill and the old man learned 9______ that he food was free 10___ it was the birthday of the boss, and they were the first customer(顾客) that day.
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