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Unique key

In relational database management systems, a unique key is a candidate key. All the candidate keys of a relation can uniquely identify the records of the relation, but only one of them is used as the primary key of the relation. The remaining candidate keys are called unique keys because they can uniquely identify a record in a relation. Unique keys can…

Summary, Defining keys in SQL & Overview

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Overview

Summary

Defining keys in SQL

Advanced semantic analysis

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Map overview Semantic statistics

Unique key

Nodes19
Edges18
Triples9
Avg. degree1.89
Density0.105263
Components1

How this topic connects Entity context

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Unique key

Top relations

related to Summary · 7
Unique key → For, Keys, One, Proper, The, The DBMS, There
is a · 2
Unique key → candidate key, pleonasm

Important terminology Word statistics

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Important terminology

key keys unique table primary database may constraint candidate one columns used sql foreign relation also called rdbms null tables

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Unique keyis acandidate key0.90text
Unique keyis apleonasm0.90text
Unique keyrelated to SummaryKeys0.60section
Unique keyrelated to SummaryThere0.60section
Unique keyrelated to SummaryFor0.60section
Unique keyrelated to SummaryThe0.60section
Unique keyrelated to SummaryThe DBMS0.60section
Unique keyrelated to SummaryProper0.60section
Unique keyrelated to SummaryOne0.60section

Related concept clusters Concept neighborhoods

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    Connections between topic areas Semantic bridges

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    Min side: 3
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