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You Are On Multi Choice Question Bank SET 917

45851. Normalization ________ data duplication.





45852. Each answer below shows example data from a table. Which answer is an example of the inconsistent values problem?





45853. When building a database from an existing set of tables, we may safely assume that referential integrity constraints have been enforced on the data we are given.



45854. Most of the time, modification anomalies cause problems that are severe enough that a table should be normalized into BCNF.



45855. When building a database from an existing set of tables, we still need to consider normalization principles.



45856. We have normalized a table into BCNF if all candidate keys are determinants.



45857. We use the SQL construct COLUMNS() to determine the number and type of columns in a table.



45858. One common design problem when designing a database from existing data is the use of a single cell in one column to store multiple values of an attribute.



45859. In all cases, normalization into BCNF is desirable.



45860. Denormalized tables are in BCNF.



45861. We can eliminate modification anomalies with proper normalization that results in tables in BCNF.



45862. Proper normalization eliminates duplicated data.



45863. The design guidelines and priorities for read-only databases are different because read-only databases are never updated.



45864. The phrase "SALE.CNumber must exist in CUSTOMER.CNumber" is a referential integrity constraint.



45865. We use the SQL construct COUNT() to count the number of rows in a table.



45866. When you are given a set of tables and asked to create a database to store their data, the first step is to create the new database.



45867. Multivalued dependencies create harmless anomalies that should be noted, but do not always need to be eliminated.



45868. One common design problem when designing a database from existing data is the use of a general-purpose remarks column in the received data.



45869. One common design problem when designing a database from existing data is the presence of missing values, called blank values, in received data.



45870. Normalization requires programmers to write more complex SQL.



45871. One common design problem when designing a database from existing data is the presence of inconsistent values in the received data.



45872. When building a database from an existing set of tables, we may safely assume that there are no multivalued dependencies in the data we are given.



45873. Needing to using more complicated SQL in database applications is a(n) ________ of normalization.





45874. Eliminating modification anomalies is a(n) ________ of normalization.





45875. Multivalued dependencies should ________ be eliminated.





45876. 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:





45877. Using the SQL GROUP BY phrase with a SELECT statement can help detect which of the following problems?





45878. Piston rings are provided to:





45879. Thermostat valve helps the engine to:





45880. In a four stroke engine the cam shaft turns at:





45881. Mechanic X says that all OHC engines have rocker arms.Mechanic Y says that some bucket tappets and no rocker arms.Who is correct?





45882. Valve overlap occurs at:





45883. RFM analysis uses customers' purchasing patterns to ________ .





45884. The "F" in RFM analysis stands for ________ .





45885. We have Market Basket data for 1,000 rental transactions at a Video Store. There are for videos for rent -- Video A, Video B, Video C and Video D. The probability that both Video C and Video D are rented at the same time is known as ________ .





45886. Business Intelligence (BI) reporting systems cannot do which of the following operations?





45887. Which of the following is not a component of a data warehouse?





45888. Business Intelligence (BI) reporting analyses can be performed using ________ .





45889. We have been given access to the company's operational data, and have been asked to produce a report. We discover that some of the data we need are in an SQL server database while other needed data are in a separate Oracle database. This is an example of ________ .





45890. The reports generated by a reporting system are usually not delivered in which of the following media?





45891. Data mining applications are used accomplish which of the following tasks?





45892. Which of the following is an unsupervised data mining technique?





45893. In OLAP, we are interested in ________ .





45894. Which of the following is not a reason that operational data are difficult to read?





45895. We have Market Basket data for 1,000 rental transactions at a Video Store. There are four videos for rent -- Video A, Video B, Video C and Video D. The probability that Video D will be rented given that Video C has been rented is known as ________ .





45896. One popular classification technique in Business Intelligence (BI) reporting is ________ .





45897. We have done an RFM analysis on our customer data. Mary Jones has a score of "1 1 5". This series means that Mary ________ .





45898. Business Intelligence (BI) systems do not obtain data from operational databases.



45899. Data Mining uses simple arithmetic techniques such as sums, averages, and groupings to perform what-if analyses, to make predictions, and to facilitate decision making.



45900. A data warehouse is a database system that is optimized for operational transaction processing.



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