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An Entity-Relationship (ER) model is commonly referred to as a semantic data model. It focuses on defining the entities, attributes of the entities, and the relationships between entities to capture the meaning of data in a domain. This model helps to visualize and understand the semantics of the data being represented.
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When a data field is private it is said to be?
When a data field is private, it is said to be accessible only within the class where it is defined. Other classes cannot access or modify it directly. This helps to maintain data encapsulation and restrict external interference with the data.
An attribute has what?
An attribute is a characteristic or feature that describes an object, entity, or phenomenon. It provides information about the object, such as its properties, qualities, or states. In data modeling, attributes are used to define the structure and properties of data elements in a database or system.
What is View Serializable in DBMS?
View Serializable is a correctness criterion in database management systems that ensures that the final result of executing concurrent transactions is the same as if they were executed one after the other. This property helps maintain data consistency and ensures that the database remains in a consistent state despite concurrent transaction execution. Transactions are said to be view serializable if their interleaved execution produces the same results as if they were executed sequentially.
What are the methods for collecting primary data?
Some methods for collecting primary data include surveys, interviews, observations, experiments, and focus groups. Surveys involve asking a series of questions to a sample of individuals. Interviews involve direct conversations with participants to gather information. Observations involve watching and recording behavior in natural settings. Experiments involve manipulating variables to test cause-and-effect relationships. Focus groups involve group discussions to gather insights on a specific topic.
What is Biometric Identification system for ACCESS (BISA) information is stored on?
According to the US biometric military task force, biometric capabilities enabled US troops to capture more than 400 "high value individuals" in Iraq and Afghanistan in 2008. Assistant director of the task force Lisa Swan said: " very well we catch the bad people. " After several years of compiling large biometric databases containing credentials for more than 2.5 million Iraqis, US Military has been connected to technology. Fingerprints and irises are checked against the Biometric Verification or iron of the persons being requested before Iraq is allowed to pass through the checkpoints or to enter other facilities.
