What is the definition of cardinality in SQL

0 votes
My book definition of Database Systems does not match with that of the WIKIpedia, which one is correct and which one should I follow?

School Book: "The cardinality of a relation is the number of tuples it contains. By contrast, the number of tuples is called the cardinality of the relation and this changes as tuples are added or deleted. High-cardinality - many tuples, low-cardinality - few tuples."

Wikipedia: "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. There are 3 types of cardinality: high-cardinality, normal-cardinality, and low-cardinality."
Feb 18, 2022 in Database by Neha
• 9,060 points
562 views

No answer to this question. Be the first to respond.

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.

Related Questions In Database

0 votes
0 answers

What is the purpose of Order By 1 in SQL select statement?

I discovered numerous views with an order ...READ MORE

Aug 19, 2022 in Database by Kithuzzz
• 38,010 points
475 views
0 votes
0 answers

What is the purpose of using WHERE 1=1 in SQL statements?

Possible Duplicates: Why would a sql query have ...READ MORE

Aug 28, 2022 in Database by Kithuzzz
• 38,010 points
1,576 views
0 votes
1 answer

What is the use of a cursor in SQL Server?

Instead of receiving a result set as ...READ MORE

answered Sep 13, 2022 in Database by narikkadan
• 63,420 points
430 views
0 votes
1 answer

What is the equivalent of 'describe table' in SQL Server?

Use the sp_columns stored procedure: exec sp_columns MyTable I hope this ...READ MORE

answered Sep 17, 2022 in Database by narikkadan
• 63,420 points
394 views
0 votes
1 answer

What is the SQL query to get the third highest salary of an employee from employee_table

You can try out something like this: SELECT ...READ MORE

answered Sep 27, 2018 in Database by Sahiti
• 6,370 points
11,346 views
0 votes
1 answer

What is the syntax of USE statement in MySQL?

The USE statement is used to mention ...READ MORE

answered Nov 27, 2018 in Database by Sahiti
• 6,370 points
544 views
0 votes
1 answer

What is the definition of cardinality in SQL?

Cardinality is defined as the "number of ...READ MORE

answered Feb 15, 2022 in Database by Neha
• 9,060 points
1,482 views
0 votes
1 answer
0 votes
1 answer

How to change the default value and to alter a column in sql?

Hi, You can try this: ALTER TABLE foobar_data CHANGE ...READ MORE

answered Jun 24, 2019 in Big Data Hadoop by Gitika
• 65,910 points
1,148 views
0 votes
1 answer

What is an index in SQL?

An index is used to speed up ...READ MORE

answered Feb 3, 2022 in Database by Vaani
• 7,020 points
386 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP