Database test - Part 2
- Sentence 1. The operands in the operations are:
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Expressions
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Relationships
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Properties
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Value sets
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- Question 2. Modification is an operation:
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Modify the value of some properties.
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Modify the description of attributes.
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Modify the value of a relationship or a group of relationships
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Modify the value of a set or a set of sets.
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- Question 3. The correct order in the SELECT statement
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SELECT, FROM, WHERE, GROUP BY HAVING, ORDER BY
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SELECT, FROM, GROUP BY HAVING, ORDER BY
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SELECT, FROM, GROUP BY HAVING, ORDER BY
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SELECT, FROM, GROUP BY HAVING, WHERE, ORDER BY
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- Question 4. Collection operations in the WHERE clause include:
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Relational algebraic operations
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Arithmetic operations and comparisons
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Algebra expression
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Comparisons.
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- Question 5. Group operations are used after the clause:
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SELECT
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FROM
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WHERE
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GROUP BY
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- Question 6. Selection is made after any clause in SELECT - FROM - WHERE
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GROUP BY HAVING
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WHERE
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SELECT
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FROM
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- Question 7. Data Definition Language - DDL (Data Definition Language).
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Specified by the application program
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Specified by a part of the database management system.
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Specified in a data language
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Specified in a language, part of the database management system.
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- Question 8. The two expressions E1 and E2 are equivalent, denoted by E1 E2, if:
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They represent the same mapping.
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The same relationships in expressions.
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The results are the same
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Relationships in defined domain expressions
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- Question 9. Secure network level.
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Information protection on transmission lines
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Allow remote, controlled access
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Allow remote access
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Do not allow remote access
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- Sentence 10. Access form in SQL:
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GRANT ON TO
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GRANT ON TO
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GRANT ON TO
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GRANT READ ON R
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- Question 11. Select which of the following statements is most appropriate
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Data inconsistencies in storage make data lose integrity
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Data integrity ensures data is always correct
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Data consistency ensures easy updates and additions
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Hosted organization according to database theory, repeatable attributes
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- Question 12. Select which of the following statements is best:
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Data is represented, describing many different ways.
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Users working on databases can alter the data storage structure and database access strategy.
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Storage structure and the above application program systems are independent of each other.
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The goal of database systems is: the immutability of application systems for changes in storage structure and data access strategy.
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- Question 13. Choose which of the following statements is best:
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Data normalization is the process of separating relations without losing information.
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The root relationship is contained in the natural connection of projection relations.
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Data stored in the database reflects data integrity.
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Data normalization is the process of performing storage operations
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- Question 14. Choose which of the following statements is most correct when talking about goals
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Separation of relationships is the implementation of query and search optimization.
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Relationship separation is intended to ensure data independence.
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Relational separation is the optimal storage performance, memory saving.
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Relationship separation is mitigating calculations.
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- Question 15. Choosing which of the following statements is best:
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When performing separation, the original relation is not lost.
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When performing separation, the original relationship is lost.
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When performing separation, the root relationship is always lost.
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When performing separation, the root relationship can be lost.
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You should read it
- Test about database security P13
- Test on database security P7
- Test about database security P5
- Test of database security P9
- Microsoft Access has a P2 answer
- Database test - Part 3
- Test about database security P12
- Test about database security P11
- The Microsoft Access test has the answer P7
- Test on database security P6
- Test on database security P4
- The Microsoft Access test has the answer P4
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