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What role does a foreign key play in the establishment of a relationship between two entities or tables?
A foreign key is a column or a set of columns in one table that references the primary key in another table, creating a relationship between the two. This relationship ensures data integrity by enforcing referential integrity constraints, allowing for the proper establishment of connections between related data in a database. It helps maintain data consistency by preventing actions that would create orphaned records or violate the defined relationship between the tables.
What is the relationship between two data sets when one data set of data values increases while the other decreases?
There is an inverse relationship between the datasets.
What is the relationship between two data sets when their data values increase or decrease together?
It is a positive relationship.
What are the advantages and disadvantages of Entity Relationship Diagrams?
Entity-Relationship diagrams are useful for modelling data and the relationships between the data. They can be used when the constraints between data are relatively simple. They do not allow specification of interactions between the data or model how the data changes (there are no processes in Entity-Relationship). Entity-Relationship diagrams are most often used to model databases.
What represents a correspondence between various data elements?
relationship
Which term is defined as a close relationship between two organisms of different species?
A symbiotic relationship is defined as a close relationship between two organisms of different species. This relationship can be mutually beneficial (mutualism), one-sided benefit (parasitism), or neutral (commensalism).
What is the relationship between telecommunication and data communication?
They are both forms of communication They are both a form of communication; data communication is a subset of telecommunication, telecommunication send data between two links by means of electromagnetic. (Like satellite), while data communication means send data by telecommunication, it consists of codes of 0's and 1's. In computer means, Data communication is digital data and telecommunication is equipped to send digital data to receiver.
What describes the relationship between one set of data that decreases as another set of data increases?
The relationship between one set of data that decreases as another set of data increases is described as an inverse or negative correlation. In this scenario, when the values of one variable rise, the values of the other variable fall, indicating that they move in opposite directions. This type of relationship can be observed in various contexts, such as the relationship between supply and price or the relationship between demand and price.
What is the difference between graphs and data charts?
A graph is an image representing a mathematical concept, such as the relationship between a set of linked objects, or that of a set of points and the function operating on those points. A data chart is an image which visually presents the relationship between two data sets, one of which may or may not be a function of the other. There is some overlap, as a particular graph can also be a data chart. For example, a plotting of the parabola defined by the function y=x2 is a graph. A plotting of the variable curve defined by the number of animals in a region vs. the amount of available food is a data chart. And a plotting of the logarithmically-curved line showing how the mass of stars relates to their age could very well be both.
What is the characteristics of dbms?
Basic Characteristics of DBMS• Represents complex relationship between data• Controls data redundancy.• Enforces user defined rules.• Ensures data sharing.• It has automatic and intelligent backup and recovery procedures.• It has central dictionary to store information.• Pertaining to data and its manipulation.• It has different interfaces via which user can manipulate the data.• Enforces data access authorization.
What is the type of correlation where there in no relationship between two data sets?
There is no correlation.
What are the relationship between pairs of data values could be examined from a?
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