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: bar code
Explanation: that is what it is
True they can pretty much see anything you do and on top of that they can look through your cameras. thats why i keep tape on my camera on my laptop
Answer:
solar light
Explanation:
This is because at this time, the sun is in the right place to illuminate the scene from the right angles, without overpowering the photograph. Light is one of the most important factors to take into account when taking a photograph.
