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Referential integrity is a database concept that ensures that relationships between tables remain consistent. When one table has a foreign key to another table, the concept of referential integrity states that you may not add a record to the table that contains the foreign key unless there is a corresponding record in the linked table. It also includes the techniques known as cascading update and cascading delete, which ensure that changes made to the linked table are reflected in the primary table.
By Mehari Tewelde
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What is a relational database query and Explain with an example?
A relational database matches data by using common characteristics found within the data set. The resulting groups of data are organized and are much easier for many people to understand.For example, a data set containing all the real-estate transactions in a town can be grouped by the year each transaction occurred, the sale price, a buyer's last name and so on. Such a grouping uses the relational model (a technical term for this is schema). Hence, such a database is called a "relational database."The software used to do this grouping is called a relational database management system (RDBMS). The term "relational database" often refers to this type of software.Relational databases are currently the predominant choice in storing data like financial records, medical records, personal information and manufacturing and logistical data.
Explain the 6 steps in problem solving in office management?
(a) Explain the 6 steps in problem solving
What is the punchline to bridge to algebra page 114?
please explain the question better. no one knows what txtbook you are talking about unless you explain it.
Explain the purpose of the discriminant?
the purpose...... it yet to be known
Can a triangle and a square be congruent if yes can you explain?
no they cant be congruent - Emily grade 7
Define the two principle integrity rules for the relational modelDisscuss why it is desirable to enforce these rules also explain how DBMS enforces these integrity rules?
Define the two principle integrity rules for the relational modelDisscuss why it is desirable to enforce these rules also explain how DBMS enforces these integrity rules?
Explain the differences between entity integrity and referential integrity?
Entity integrity ensures that each row in a table is uniquely identifiable by a primary key, while referential integrity ensures that relationships between tables are accurately maintained when data is inserted, updated, or deleted. In essence, entity integrity concerns the uniqueness of data within a table, and referential integrity concerns the relationships between data across different tables.
Explain two rules in relational model of database systems?
1) Entity Integrity: In a base relation, no attribute of a primary key can be null. 2) Referential Integrity: If foreign key exists in a relation, either foreign key value must match a candidate key value of some tuple in its home relation or foreign key value must be wholly null
Explain the select Operation in Relational Algebra with an example?
Relational Algebra - Example
What is relational database Explain the purpose of creating database?
A relational database is a type of database that stores and organizes data in tables with a predefined structure. The purpose of creating a database is to efficiently store, manage, and retrieve data for various applications or systems. Databases help to ensure data integrity, enable data sharing, provide a structured way to store information, and support data analysis and reporting.
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.
Explain the ill effects of land pollution?
What political constraints might influence decisions on global warming
Explain why cell can differ so much in size?
Some cells have constraints on their size, for instance a cell wall, whereas other cells have flexible cell membranes, which pose no constraints on the cell size.
2 Explain why navigation is simple in Relational Data Model than in Hierarchical?
Navigation in the Relational Data Model is simpler than in the Hierarchical Data Model due to the relational structure of tables linked by common keys. In the Relational Data Model, data is organized into tables with rows and columns, allowing for easy querying and retrieval of information using SQL queries. On the other hand, in the Hierarchical Data Model, data is organized in a tree-like structure with parent-child relationships, making navigation more complex and requiring traversal of multiple levels to access specific data points.
Difference between database and relational database explain with example?
Database = Generic name for a system to store data Relational Database = A specific type of database that utilizes relationships between data to not only store the data but further its efficiency in its manipulation.
Which type of data is used to explain a relationship?
A foreign key constraint is used to represent a relationship in a RDBMS (relational database management system).
Explain the distinction between total and partial constraints?
Total constraints are those in which a table's existence requires the existence of an associated table in a particular defined relation between them. whereas Partial constraints are involved with the tables in which presence of one table is partial for the associated table.
