Why you should care
Primary Key is a column or combination of columns that uniquely identify a record. Only one candidate key can be a primary key.
There has be care taken in selecting the Primary Key as an incorrect selection can have negative impact on the database architect and future normalization.
A candidate key should be Non-NULL and unique in any domain to qualify as a Primary Key
How we detect
A unique key or primary key comprises a single column or set of columns. No two distinct rows in a table can have the same value (or combination of values) in those columns.
Depending on its design, a table may have arbitrarily many unique keys but at most one primary key.
About CAST and Highlight’s Code Insights
Over the last 25 years, CAST has leveraged unique knowledge on software quality measurement by analyzing thousands of applications and billions of lines of code. Based on this experience and community standards on programming best practices, Highlight implements hundreds of code insights across 15+ technologies to calculate health factors of a software.