Application stage BUPT "Database Principles and Applications" Job answer four belts

A multiple-choice (a total of 10 small problem, a total 100.0 points) 1. In the following statements about the relationship, the error is _____. Table A. any two rows can have the same value B. Table arbitrary two can have the same C. order of rows in the table does not matter D. It does not matter the order listed in the table Knowledge points: Relations Relation Student answers: [B;] Score: [10] Questions scores: 10.0 2. The narrative about primary keys below the right is ______. A. different recording may have duplicate primary key values ​​or a null value B. a primary key of the table may be one or more fields C. In a primary key table may be only one field D. The data type of the primary key of the table must be defined as automatic number or text Knowledge points: Key code Student answers: [B;] Score: [10] Questions scores: 10.0 3. known relationship R as shown below, can be used as the primary key attribute group relation R is _____. A. ACD B. ABC C. US D. BCD Knowledge points: Key code Student answers: [C;] Score: [10] Questions scores: 10.0 4. The relational database, the link between the entities is achieved between ______ table by table. A. Public Index B. Public storage C. Public tuple D. Public Properties Knowledge points: Contact relational database Student answers: [D;] Score: [10] Questions scores: 10.0 5. define the foreign key is implemented ______. A. entity integrity B. referential integrity C. User-defined integrity D. entity integrity, referential integrity and the integrity of the user-defined Knowledge points: Relational integrity rules Student answers: [B;] Score: [10] Questions scores: 10.0 6. There is a relationship: Student (Student ID, name, academic departments), the provisions of range of student number is a string of eight digits, the rule belongs to _____. A. entity integrity rule B. referential integrity constraints C. User-defined integrity rules D. keywords integrity constraints Knowledge points: Relational integrity rules Student answers: [C;] Score: [10] Questions scores: 10.0 The basic components of the model is ______ 7. ER. A. fields and records B. database structure and properties C. entities Contact D. and property records Knowledge points: Database Design Process Student answers: [C;] Score: [10] Questions scores: 10.0 8. If the link between two entities is 1: m, to achieve the 1: The method of contact is ______ m. A. adding "1" at the end of the conversion relation entity relationship side entity converting "m" of the code B. A code conversion relationship "m" of the entity that added to end relationship "1" C. Relationship between the two entities in the conversion, relations were added to another code D. converted into a relationship between two entities Knowledge points: Database Design Process Student answers: [A;] Score: [10] Questions scores: 10.0 9. The database is divided three mode architecture, ______ is conducive to maintaining the database. A. data independence B. Data Security C. standardized structure D. operational feasibility Knowledge points: Database architecture Student answers: [A;] Score: [10] Questions scores: 10.0 A suitable logical structure data 10. How to construct the main problem is _____. A. Relationship Database Optimization B. Data Dictionary C. relational database normalization theory D. relational database query Knowledge points: Relations standardization Student answers: [C;] Score: [10] Questions scores: 10.0

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