Key

In Data Science, a key is a field or set of fields that uniquely identifies a record in a database table. Keys are used to establish relationships between tables and to ensure data integrity. There are several types of keys, including primary keys, foreign keys, and composite keys. A primary key is a unique identifier for a record in a table, and it cannot contain null values. A foreign key is a field in one table that refers to the primary key in another table, establishing a relationship between the two tables. A composite key is a key that consists of two or more fields, used when a single field cannot uniquely identify a record. Keys are essential in data modeling and database design, as they ensure that data is organized and can be accessed efficiently.
Your Previous Searches
Random Picks
  • Census Data: Census data refers to the demographic and socioeconomic information collected from a population at a specific point in time. In the context of data science, census data is often used to gain insights into the characteristics of a population ... Read More >>
  • Internet-based Platforms: Internet-based platforms refer to online software systems that enable users to interact and exchange information with each other. These platforms are designed to facilitate communication, collaboration, and data sharing among users. Interne ... Read More >>
  • Data.table: Data.table is a package in R programming language that provides an enhanced version of data.frame with faster performance, efficient memory usage, and syntax optimizations. It is designed to handle large datasets with ease and speed, making ... Read More >>
Top News

Tech giants see emissions surge 150 percent in 3 years amid AI boom: UN...

Artificial intelligence, cloud computing and data centres led to a spike in electricity demand between 2020 and 2023....

News Source: Al Jazeera English on 2025-06-06

‘Ghost networks' are harming patients, but attempts to eliminate them have fal...

Insurance companies often refer patients to lists of providers who are unreachable, out of network or don’t accept new patients....

News Source: NBC News on 2025-06-05

Palantir CEO Karp says AI is dangerous and 'either we win or China will win'...

Palantir CEO Alex Karp said the artificial intelligence arms race between the U.S. and China will culminate in one country coming out on top....

News Source: NBC News on 2025-06-05

Palantir has soared 74% this year alone. 3 reasons why it's been one of the worl...

Palantir was the second-most bought stock among retail traders in the last five days, according to a firm that tracks flows from individual investors....

News Source: Business Insider on 2025-06-05

Harris-Walz campaign may have been targeted by iPhone hackers, cybersecurity fir...

One of the few companies to specialize in iPhone cybersecurity said that it has uncovered evidence of a potentially groundbreaking hacking campaign....

News Source: NBC News on 2025-06-05