Answer:
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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:
<span>You could use cloud storage. Basically, the things you save are actually saved on another computer, that is, on another server, that is used as a hard drive for many pcs. You can access the cloud storage if you have internet and it works like a normal hard drive. There are even laptops that don't have storage other than cloud storage.</span>
Answer:
The correct option is D: Control Bus
Explanation:
A control bus is usually used by the Central Processing Unit to communicate with all the devices that are connected or contained within a computer. This connections are usually done via physical connections such as printed circuits or cables. It is also called a Computer bus and helps in coordinating activities between the connected devices.
