Answer:
A primary key is a special relational database table column (or combination of columns) designated to uniquely identify each table record. A primary key is used as a unique identifier to quickly parse data within the table. A table cannot have more than one primary key.
Primary Key.
Candidate Key.
Alternate Key.
Super Key.
Composite Key.
Foreign Key.
Unique Key.
In the relational model of databases, a primary key is a specific choice of a minimal set of attributes that uniquely specify a tuple in a relation. Informally, a primary key is "which attributes identify a record," and in simple cases constitute a single attribute: a unique ID.
Explanation:
Answer:
Image result for what is the name of the fields in an x.509 digital certificate that are used when the parties negotiate a secure connection?
Common applications of X. 509 certificates include SSL/TLS and HTTPS for authenticated and encrypted web browsing, signed and encrypted email via the S/MIME protocol, code signing, document signing, client authentication, and government-issued electronic ID.
Explanation:
Answer:
Option D is correct.
Explanation:
The Digital Revolution applies to technological improvements from optical automated and mechanical machines to that of the digital technology that is currently accessible. The era began well into the year of 1980s, and continues. That Digital Revolution still marked as the start of the Era of Info.
- It's the evolution of electrical and analog to digital technologies.
- Its the advent of digital technologies has also altered the manner of people communication.
- The following things are only done through computers, cellphones, as well as the web.
Types in java are divided into two categories. the primitive types are boolean, byte, char, short, not, long, float, and double. all other types are REFERENCE types
