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Unique key
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Articles about Unique key
- Article · SQL Server
Primary Key and Unique Key Constraints
Primary Key and Unique Key Constraints in database management ensure data integrity and uniqueness. A Primary Key ensures each row is unique and not null, with only one per table. Unique Keys also ensure uniqueness but can include nulls and multiple constraints per table. Both support indexing and relationships.
- Article · SQL Server
Difference Between Primary key and Unique key in SQL
The difference between Primary Key and Unique Key in SQL lies in their fundamental roles within a database schema. A Primary Key uniquely identifies each record in a table and ensures data integrity by disallowing NULL values and duplicates.
- Article · SQL Server
Unique Key in SQL: Syntax, Usages, and Example
Unique Key in SQL ensures each record in a database table is distinct. Syntax involves defining columns with UNIQUE constraints. It prevents duplicate values, enhancing data integrity and search efficiency.
- Article · SQL Server
Understanding SQL Server Constraints
In this article, I am going to explain SQL Server constraints such as Unique key constraint Primary key and foreign key and how to implement constraints in SQL Server.
- Article · Databases & DBA
Constraints in Oracle : Part 1
This article explains the Constraint clause in Oracle that is basically used to apply the specific rules to the data that restrict the values/data entered into the database columns.
- Article · SQL Queries
Database Design and Various Useful Definition
The article is about Normalization, DeNormalization, one-to-one, one-to-many, many-to-many, Primary key, Unique key, User Defined Datatypes, Bit Datatype, Bit Column, Candidate Key, Alternate Key, Composite Key, Defaults.
