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: True
Explanation: Gen/Spec is the known as the general specification standard for the classes.This standard helps in bringing out the peer-to-peer relations of class.
Gen/Spec is used in class diagram because it helps in the display of the access sharing and class specification in the general form for the required instances.Thus, this standard helps in the enhancement of the class diagram and its inheritance. So, the statement given in the question is true.
Answer:
C. External Data
Explanation:
On the External Data tab, you can find import and export commands located in Access.
Answer:
Odd question but okay....
Explanation:
Earth's surface, also known as "Land", has very many biotic(animals) and abiotic factors (plants). There are also a wide variety of land features such as mountain, plains, Hills, etc..
Within these features are small - Large ecosystems we're plants and animals thrive to create a bigger and stronger wildlife.
"Land" is a very simple word that stands for all of the different plants, mammals, ecosystems, aquatic animals and many more ways of life on Land.
I hope this helps...
I think the answer is b
hope this helps :)
