A primary key in Microsoft Access that contains more than one field is known as

Question

A primary key in Microsoft Access that contains more than one field is known as a(n): combined primary key double primary key O auto key concatenated primary key QUESTION 3 Which of the following is NOT one of the steps in integrating business process level REA view models? O Perform set intersections of class attributes (i.e., in the integrated view, include only those attributes that the class has in each Re-name associations as necessary to ensure uniqueness of association names of the separate views) Either merge the models based on a common class, or remove the attributes from one copy of the class and put a slash through the corner to show it is a copy of an existing class Determining which class or classes are shared by the view models All of the above are part of view integration

Explanation / Answer

A primary key in Microsoft Access that contains more than one field is known as a

Ans:- Concatenated primary key:

Also known as composite primary key is a combination of two or more column values used to define a key in a table.

Composite key:-

A composite key consists of more than one field to uniquely identify a record.

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Question 3:-

1) Association Definitions:

--> Stockflow

Relationship between an economic event and its associated resources

--> Duality

The relationship between the increment and decrement events in a process. Shows "why" we transfer our resources. What we get in return.

--> Inside

Between an even and inside agent

--> Outside

Between and event and outside agent

So re-name association is as necessary to ensure uniqueness of association names.

2)  The core REA ontology resides on the intersection of the (h1) operational layer and the (v2) process specification layer.

So these options are also satisfied.

4) and 5) options

The steps involved are:

(1) identify the event entities to be modeled,

(2) identify the resource entities changed by events,

(3) identify the agent entities participating in events, and

(4) determine associations and cardinalities between entities.

The REA Approach to Database Modeling The third and final section presents the task of view integration, in which several individual REA diagrams are integrated into a single enterprise-wide model. The steps involved in view integration are:

(1) consolidate the individual models;

(2) define primary keys, foreign keys, and attributes; and

(3) construct physical database and produce user views.

select the option:-

Either merge the models based on a common class, or remove the attributes from one copy of the class and put a slash through the corner to show it is a copy of the existing class

Reason:-

during view integration , when several individual REA diagrams are merged to form a single global model, the constellations of entities may necessarily be altered.

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