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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.
What those database comprise?
Database comprises of records that are related to each other. In database the data is stored in the form of tables, are called database tables .
What is the difference between Primarey key and Forn Key?
establishing a relation between two tables called fornkey.......the colum name should be unique is called "primary key"...a table contain only one primary key...a table contain more then one fornkey....
What is the difference between data model and database model?
A database is a collection of tables that is used for some purpose (typically an application of some sort). A database model is a description of that database, and describes how the tables relate to each other. Typically, a model is designed first, then the actual database is implemented using the model as a blueprint.
What does SQL CREATE VIEW achieve?
SQL CREATE VIEW achieves the creation of a table or tables in the SQL database. One can then create tables to the purpose they desire and fill them in with information.
What is the most common type of relationship between tables in a relational database?
one-to-many relationship
What is the most common type of relationship you will encounter between tables?
one-to-many relationships
In relational database when two tables have common field the link between tables is know as a hyperlink?
Actually, in a relational database, when two tables have a common field, the relationship between the tables is known as a foreign key constraint. This constraint ensures that values in the common field of one table correspond to values in another table, helping maintain data integrity and enabling queries across related tables.
What are Joins in dbms?
A join is a temporary relationship that you can create between two tables in a database query that do not already have an established relationship or common field with the same fieldname or data type. Database tables that are joined in a query are related in that query only, and nowhere else. The type of join that you use indicates which records the query will select or perform the chosen actions on.
How many to many relationship are established?
A junction table is added between the two tables involved in the relationship. The primary key from each table is added to the junction table and they are made a joint primary key in that table. Then two one-to-many relationships are set up between the junction table and each of the two other tables.
How are relationship between tables expressed in a relational database?
Tables are the basic building blocks of a relational database.
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.
In order for two tables to have a relationship they must contain a common?
In order for two tables to have a relationship, they must contain a common field or key, known as a foreign key in one table that relates to a primary key in the other table. This relationship allows data to be linked and retrieved together from both tables.
What is the term for a database that contains multiple tables of information that can be joined through common fields?
The term for a database that contains multiple tables of information that can be joined through common fields is a relational database. In relational databases, data is structured into tables, each with rows (records) and columns (fields), and relationships between tables are established through keys.
Data from two or more tables can be connected by specifying a?
relationship or join condition between a common column in each table. This connection allows us to retrieve related data from multiple tables in a database query. Join conditions typically involve matching values between the related columns in the tables being joined.
What happen when you delete foreign key?
You will lose the connection between the tables and break the relationship.
The purpose of the primary key in building the relationship between tables?
primary keys are unique
