Primary Key
Everything on SkillVeris tagged Primary Key — collected across the glossary, study notes, blog, and cheat sheets.
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Interview Questions(5)
What is Normalization in Database?
Normalization is the process of organizing data in a database to reduce redundancy, avoid anomalies, and improve data integrity.
Difference Between Primary Key and Foreign Key
A primary key uniquely identifies each row in a table and cannot be NULL, while a foreign key is a column that references the primary key of another table to l…
What is a Composite Key?
A composite key is a primary key made up of two or more columns that, together, uniquely identify a row, even though no single column among them is unique on i…
What is Referential Integrity?
Referential integrity is a database rule ensuring that a foreign key value in one table always matches an existing primary key value in the referenced table, p…
What Are 1NF, 2NF, and 3NF in Schema Design?
1NF, 2NF, and 3NF are progressive normalization rules that remove repeating groups, partial key dependencies, and transitive dependencies from a table, each le…