Can I read Primary vs Unique Key Constraints on EtoBox?
Primary vs Unique Key Constraints by Senthil Raj is a document available to read on EtoBox.
What is Primary vs Unique Key Constraints about?
The document discusses different types of constraints in SQL including primary keys, unique keys, not null, check, and foreign keys. It provides examples of creating a table with different constraints on columns and examples of inserting data that violates these constraints. The key points covered are: - There are 5 main types of constraints: primary key, unique key, not null, check, and foreign key. - Primary keys enforce uniqueness and do not allow nulls. Unique keys are also unique but can allow nulls
- Author
- Senthil Raj
- Language
- EN