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What is the condition for a key to be a foreign key?
A key is considered a foreign key if it references the primary key of another table to establish a relationship between the two tables. It enforces referential integrity, ensuring that data in the foreign key column corresponds to data in the primary key column.
What is the function of a Foreign Key in SQL?
A Foreign Key in SQL is used to establish a relationship between two tables. It ensures referential integrity by enforcing that values in a column (or columns) in one table must match the values in a primary key in another table. This helps maintain consistency and data integrity across linked tables.
When checking the database you confirm that the Enforce Foreign Key Constraint property is set to Yes as expected. What property does this constraint create for the database?
The Foreign Key Constraint property creates a relationship between two tables in the database. It enforces referential integrity, ensuring that a foreign key column in one table must have a corresponding primary key value in another table. This helps maintain data consistency and avoid orphaned records.
How can a Foreign Key and a Primary Key interact with each other?
In some database systems, A Foreign Key that is set on one column (the child column ) has to point to another column (the parent column ) that is indexed. The parent column could be a primary key, since a primary key creates an index. Primary keys also keep values in the parent column unique, which can ensure unique records in the parent column's table; having a unique key on the child column can further enforce unique data that links with the unique records in the parent column .
What does the term foreign key mean in databases?
The foreign key is used as a reference in a table to the primary key of another table. For example: consider a table employee with id(primary key), name, address,department_id(foreign key) as its fields.Another table department with fields department_id(primary key) and dept_name. So, department_id is primary key in department table and foreign key in employee table.
What is the difference between relation and relationship in database?
Relation: In Database a relation represents a table or an entity that contain diffrenet attributes.An Entity constructs a relation(table) in DBMS . Relationship: In Data base relationship is that how the two entities are connected to each other ,i.e what kind of relationship type they hold between them.Primary/Foreign key is used to specify or hold this relationship. By Tanzeel Ur Rahman Bhatti
Using foreign key on ER diagram?
Foreign keys isnt drawn at a ER-diagram. The relation drawn between entities is enough to show, that der is at foreign key
What is the foreign relationship between Uganda and Haiti?
wicked.
which of these may be targeted by foreign entities?
all of them
What is the relationship between tables in library management system?
In a library management system, tables represent different entities such as books, users, transactions, etc. The relationship between these tables is established through keys like primary keys and foreign keys. For example, the books table may have a primary key "book_id" which is referenced as a foreign key in the transactions table to link books with users.
What happen when you delete foreign key?
You will lose the connection between the tables and break the relationship.
What is Foreign intelligence entities?
A Foreign Intelligence Entity is a term in which describes organizations who are based abroad with the purpose to use various intelligence techniques in order to gather specific information. These entities can be government and non-government.
When a relationship exists between two tables in a database for Microsoft acess what name is given to the matching field in the related table?
The field in a related table that matches a field in another table is called a foreign key. This foreign key establishes the relationship between the two tables in a database.
What key defines a relationship between two tables 1 Primary key 2 Secondary key 3 Foreign key?
Foreign key is used to define a relationship between two tables by referencing the primary key of another table. It ensures data integrity and enforces referential integrity between the related tables.
What information is stored in a bridge table?
A bridge table stores the many-to-many relationship between two entities in a database. It typically contains two foreign keys that reference the primary keys of the related tables, establishing the connections between them. Bridge tables facilitate querying and managing complex relationships in a relational database.
What are the basic components of a database?
Tables, Entities, Attributes, Primary Keys, and Foreign Keys
What is a foreign key in Microsoft Access?
It is a field in one table that is a primary key in another table. It is used to create a relationship between two tables, normally a one to many relationship. The one side is where it is the primary key and where it is the foreign key, that is the many tables.
