Chapter 03 The Relational Database Model

A ___ is a illustration of the relational database’s entities, the attributes inside these entities and the relationships between these entities. The ___ is actually a system-created database whose tables store the user/designer-created database traits and contents. 31) The ______ is actually a system-created database whose tables store the user/designer-created database traits and contents.

___ combines all rows from two tables, excluding duplicate rows. The ___ information model is said to be a semantic knowledge mannequin. In the ___ model, the fundamental logical structure is represented as an upside-down tree. Interest in graph databases could be tied to the world of social networks. Key-value and doc databases are structurally comparable. A candidate key could be described as a superkey without pointless attributes–that is, a minimal superkey.

A _____ relationship exists when an affiliation is maintained inside a single entity. In the original Chen notation, every attribute is represented by an oval with the attribute name connected to an entity rectangle with a line. In the Chen and Crow’s Foot notations, an entity is represented with a rectangle containing the entity’s name.

Question 9 of 35 1 Points A subtype contains attributes which may be frequent to all of its supertypes. A _____ is the set of potential values for a given attribute. Question 23 of 35 1 Points The _____ constraint can be positioned on a column to ensure that every row in the desk has a price for that column. Question 19 of 35 1 Points A _____ key can be described as a minimal superkey, a superkey without any unnecessary attributes. The most helpful characteristic of PL/SQL blocks is that they let a designer create code that can be named, stored, and executed by the DBMS.

Usually, an information modeler makes use of a pure identifier as the ____ of the entity being modeled, assuming that the entity has a natural identifier. Subtypes that contain non-unique subsets of the supertype entity set are known as ___ subtypes. In the relational model, ___ are important because the walking dead pubfilm they are used to ensure that every row in a desk is uniquely identifiable. At the implementation degree, the supertype and its subtypes depicted in the specialization hierarchy keep a ___ relationship. A specialization hierarchy can have ___ levels of supertype relationships.

___ are important as a outcome of they help to ensure knowledge integrity. A ___ is anything about which information are to be collected and stored. ____ information exist in a format that does not lend itself to processing that yields information. When utilizing a HDFS, the ______ node creates new information by communicating with the ______ node. The name, MongoDB, comes from the word humongous as its builders supposed their new product to help extraordinarily giant information sets. Hive is an effective choice for jobs that require a small subset of data to be returned very quickly.