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A Cardinality Constraint is when a certain relation can only have a certain number of instances for a relationship. For example, a Voter can only vote once in an election. Thus, there needs to be a cardinality constraint on the relationship VotedIn that relates a Voter to Election.
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What is Minimum and Maximum Cardinality?
Minimum and maximum cardinality refer to the constraints on the number of instances of one entity that can be associated with instances of another entity in a relational database or entity-relationship model. Minimum cardinality specifies the least number of instances required, such as "zero" (optional) or "one" (mandatory), while maximum cardinality indicates the upper limit, such as "one" (single instance) or "many" (multiple instances). Together, these concepts help define the nature of relationships between entities, ensuring that data integrity is maintained in the database design.
What is mapping cardinality?
Mapping cardinality refers to the relationship between two sets in terms of how many elements from one set are associated with elements in another set. It is commonly used in database design and entity-relationship modeling to specify the number of instances of one entity that can or must be associated with instances of another entity. Cardinality can be classified as one-to-one, one-to-many, or many-to-many, affecting how data is structured and accessed. Understanding mapping cardinality is crucial for ensuring data integrity and optimizing database performance.
Explain the steps in the design of an MIS?
1. Data collection through interview, source documents and personal observation. 2. Defining the problem in deatil. 3. Setting the system objective. 4. Establishing constraints. 5. Determining information needs and sources. 6. Develop alternative designs and select the best. 7. Documenting the conceptual design. 8. Detailed system analysis
What are some experimental design flaws that may explain why you don't get 100 percent yield?
What are some experimental design flaws that may explain why you don't get 100% yieldin the balloon lad
What are the factors for determining the sample design?
In the process of developing a sampling design for this study, there are some critical factors you should consider. Explain five of these factors.
Database Design?
form_title=Database Design form_header=Transform your company by incorporating a new database design. What program will the database be used with?=_ Please explain what you will be using the database for?="" Do you have a database that you're already using?= () Yes () No
What is intension in dbms?
In database management system (DBMS), intension refers to the structure or schema of the database. It defines the overall design and organization of the database, including tables, columns, data types, constraints, and relationships. It serves as a blueprint for creating and managing the database.
Could you explain the purpose of logical database design?
Logical database design is the process of designing the database at a conceptual level as opposed to a physical level. There are many advantages of conceptual database design, such as the ability to design the database without having to commit to a particular database management system, to produce a document that is readable and understandable to everyone in the company (not just the database person) and to produce an overall design document that can be saved as a part of the documentation of the database for future enhancement, maintenance and support work. Logical database design produces documents for use in the same way that architects produce blueprints for building purposes.
Database?
form_title=Database Design form_header=Transform your company by incorporating a new database design. What program will the database be used with?=_ Please explain what you will be using the database for?="" Do you have a database that you're already using?= () Yes () No
Design a Web Database?
form_title=Design a Web Database form_header=Hire a developer to design a database to complement your business. What kind of business is the database design for?=_ What will you need the database design to offer?=_ Will you need ongoing support for the design?= () Yes () No () Not Sure
What are the responsibilities of the database designer?
As the name implies, a database designer develops both the logical and physical design of the database. For hierarchical databases, they define the parent-child relationships and in relational tables, the relations between tables. They also often develop validation rules, constraints and the like.
Discuss various errors that occur during database design. explain various database integrity issues in detail.?
i am not aware about it.if u get to know then let me know
What is database design?
Design of the database (Database Design) refers to a given application environment, optimize the structure of the database, the database and applications, which can efficiently store data to meet the application needs of various user information needs and processing requirements). At www. myelibrary.net.In you can clearly understand what is the database design.
Is possible that during the physical database design and creation step of database development you might want to return to logical database design activity?
There are many reasons why this could occur, Just a few: Changes or clarification of user requirements Expansion of project scope Budgetary constraints invalidating original assumptions Testing demonstrating unacceptable query processing time
Why the data dictionary is sometimes called the database designer's database?
The data dictionary is sometimes called the database designer's database because it stores metadata about a database system's structure, constraints, and definitions. Database designers use this centralized repository to manage information about data elements, relationships, and properties, aiding in the design, development, and maintenance of databases. It serves as a valuable resource for understanding and documenting the database schema for efficient management and usability.
What are the three design goals for relational databases and explain why each is desirable.?
Data integrity: Ensuring that data stored in the database is accurate and consistent by enforcing constraints, such as unique keys and foreign keys, to prevent invalid data. Scalability: Allowing the database to efficiently handle growing amounts of data and user load by optimizing data storage, indexing, and query performance. Maintainability: Simplifying the process of database maintenance, updates, and modifications by using normalization, clear data modeling, and documenting database structures.
What are some common constraints in the field of engineer design?
The answer is engineer and design.
