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- Question
An entity is a thing in the real world with an independent existence.
Options- A. TRUE
- B. FALSE
- Correct Answer
- TRUE
ExplanationEntity is a real world object
- 1. Which of the following describes a relational database?
Options- A. It retrieves data related to its queries
- B. It provides a relationship between floats
- C. It provides a relationship between integers
- D. It consists of separate tables or related data Discuss
- 2. The command to eliminate a table from a database is
Options- A. REMOVE TABLE CUSTOMER;
- B. UPDATE TABLE CUSTOMER;
- C. DELETE TABLE CUSTOMER;
- D. DROP TABLE CUSTOMER; Discuss
- 3. Legacy data is which of the following?
Options- A. Data contained in a newly-installed system
- B. Data rejected during the installation of a new system
- C. Data contained in a file system
- D. Data contained by a system used prior to the installation of a new system Discuss
- 4. When assessing the table structure of an acquired set of tables with data, accessing the validity of possible referential integrity constraints on foreign keys is (part of) the:
Options- A. first step.
- B. second step.
- C. third step.
- D. fourth step. Discuss
- 5. If a table has been normalized so that all determinants are candidate keys, then that table is in:
Options- A. 1NF
- B. 2NF
- C. 3NF
- D. BCNF Discuss
- 6. In the relational model, relationships between relations or tables are created by using:
Options- A. composite keys.
- B. determinants.
- C. candidate keys.
- D. foreign keys. Discuss
- 7. A transaction for which all committed changes are permanent is called:
Options- A. atomic.
- B. consistent.
- C. isolated.
- D. durable. Discuss
- 8. A benefit of the three-tier architecture is which of the following?
Options- A. New modules can be built to support specific business needs
- B. Performance improves for compiled SQL statements
- C. Results in a thinner client and database server
- D. All of the above. Discuss
- 9. The load and index is which of the following?
Options- A. A process to reject data from the data warehouse and to create the necessary indexes
- B. A process to load the data in the data warehouse and to create the necessary indexes
- C. A process to upgrade the quality of data after it is moved into a data warehouse
- D. A process to upgrade the quality of data before it is moved into a data warehouse Discuss
- 10. To remove duplicate rows from the results of an SQL SELECT statement, the ________ qualifier specified must be included.
Options- A. ONLY
- B. DISTINCT
- C. UNIQUE
- D. SINGLE Discuss
Database problems
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Correct Answer: It consists of separate tables or related data
Explanation:
A relational database is a digital database based on the relational model of data, a database structured to recognize relations between stored items of information. A software system used to maintain relational databases is a relational database management system.
Computer database in which all data is stored in Relations which (to the user) are tables with rows and columns. Each table is composed of records (called Tuples) and each record is identified by a field (attribute) containing a unique value. Every table shares at least one field with another table in 'one to one,' 'one to many,' or 'many to many' relationships. These relationships allow the database user to access the data in almost an unlimited number of ways, and to combine the tables as building blocks to create complex and very large databases.
Correct Answer: DROP TABLE CUSTOMER;
Explanation:
The SQL DROP TABLE statement is used to remove a table definition and all data, indexes,...
Correct Answer: Data contained by a system used prior to the installation of a new system
Correct Answer: third step.
Correct Answer: BCNF
Correct Answer: foreign keys.
Correct Answer: durable.
Correct Answer: New modules can be built to support specific business needs
Correct Answer: A process to load the data in the data warehouse and to create the necessary indexes
Correct Answer: DISTINCT
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