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数据库表之间的一对多联系通过表的 (8) 索引和子表的 (9) 索引实现。
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Choosing a date to stop will help smokers get prepared mentally.
As we have seen, the focus of medical care in our society has been shifting from curing disease to preventing disease — especially in terms of changing our many unhealthy behaviors, such as poor eating habits, smoking, and failure to exercise. The line of thought involved in this shift can be pursued further. Imagine a person who is about the right weight, but does not eat very nutritious (有影响的) foods, who feels OK but exercises only occasionally, who goes to work every day, but is not an outstanding worker, who drinks a few beers at home most nights but does not drive while drunk, and who has no chest pains or abnormal blood counts, but sleeps a lot and often feels tired. This person is not ill. He may not even be at risk for any particular disease. But we can imagine that this person could be a lot healthier. The field of medicine has not traditionally distinguished between someone who is merely "not ill" and someone who is in excellent health and pays attention to the body’’s special needs. Both types have simply been called " well." In recent years, however, some health specialists have begun to apply the terms "well" and "wellness" only to those who are actively striving to maintain and improve their health. People who are well are concerned with nutrition and exercise, and they make a point of monitoring their body’’s condition. Most important, perhaps, people who are well take active responsibility for all matters related to their health. Even people who have a physical disease or handicap (缺陷) may be "well," in this new sense, if they make an effort to maintain the best possible health they can in the face of their physical limitations. "Wellness" may perhaps best be viewed not as a state that people can achieve, but as an ideal that people can strive for. People who are well are likely to be better able to resist disease and to fight disease when it strikes. And by focusing attention on healthy ways of living, the concept of wellness can have a beneficial impact on the ways in which people face the challenges of daily life. Today medical care is placing more stress on________.
属于镇肝息风汤组成药物的是
设有图书管理数据库： 图书(总编号C(6)，分类号C(8)，书名C(16)，作者C(6)，出版单位C(20)，单价N(6,2)) 读者(借书证号C(4)，单位C(8)，姓名C(6)，性别C(2)，职称C(6)，地址C(20)) 借阅(借书证号C(4)，总编号C(6)，借书日期D(8)) 对于图书管理数据库，查询0001号借书证的读者姓名和所借图书的书名。下面SQL语句正确的是______。 SELECT 姓名，书名 FROM 借阅，图书，读者 WHERE； 借阅，借书证号=“0001”AND；
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