Table of Contents
- 1 What is the process of storing the same data item in more than one place?
- 2 Is also called a field or column in many database systems?
- 3 When more than one user is accessing same data at the same time then it is known?
- 4 In which form does the data gets stored in the database?
- 5 What is binary relationship in database?
- 6 What does cardinality mean in database?
What is the process of storing the same data item in more than one place?
Data redundancy occurs when the same piece of data is stored in two or more separate places and is a common occurrence in many businesses.
Is also called a field or column in many database systems?
|Storing the same data in more than one place is called ____.||Redundancy|
|A(n) ____ is also called a field or column in many database systems.||Attribute|
|. A(n) ____ is a person, place, object, event, or idea for which you want to store and process data.||Entity|
How are multiple entities stored in a database?
Each table in a database represents two or more entities. The relationship between different entities (in different tables) is handled by their common columns.
What is the name of a key in one table that is required to match a primary key in another table?
A foreign key is defined as an attribute or set of attributes in a relation whose values match a primary key in another relation. The syntax to add such a constraint to an existing table is defined in SQL:2003 as shown below.
When more than one user is accessing same data at the same time then it is known?
Data concurrency – Concurrent access to data means more than one user is accessing the same data at the same time. Anomalies occur when changes made by one user gets lost because of changes made by other user.
In which form does the data gets stored in the database?
Data elements within the database are stored in the form of simple tables. Tables are related if they contain common fields. 4. DBMS packages based on the relational model can link data elements from various tables to provide information to users.
Which of the following is also called a field in a database table?
Field. A database field is a set of data values, of the same data type, in a table. It is also referred to as a column or an attribute.
What is a field name in a database?
Field names. Field names are the names you give to the columns in a table. The names should indicate what data is contained in each column. See File geodatabase size and name limits or Database data and ArcGIS for more information about database specific limitations.
What is binary relationship in database?
A Binary Relationship is the relationship between two different Entities i.e. it is a relationship of role group of one entity with the role group of another entity. There are three types of cardinalities for Binary Relationships − 1. One-to-One.
What does cardinality mean in database?
In SQL (Structured Query Language), the term cardinality refers to the uniqueness of data values contained in a particular column (attribute) of a database table. The lower the cardinality, the more duplicated elements in a column.
What is on delete cascade?
ON DELETE CASCADE clause in MySQL is used to automatically remove the matching records from the child table when we delete the rows from the parent table. It is a kind of referential action related to the foreign key.
What is secondary key in DBMS?
A primary key is the field in a database that is the primary key used to uniquely identify a record in a database. A secondary key is an additional key, or alternate key, which can be use in addition to the primary key to locate specific data.