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joja [24]
2 years ago
12

Why do relational databases use primary keys and foreign keys?.

Computers and Technology
1 answer:
Andrew [12]2 years ago
8 0

Answer:

Explanation:

A relational database is designed to enforce the uniqueness of primary keys by allowing only one row with a given primary key value in a table. A foreign key is a column or a set of columns in a table whose values correspond to the values of the primary key in another table.

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Declare a structure whose tag name is Server and that contains the following fields: manufacturer, a string, model and serialnum
NemiM [27]

Answer:

The answer to this question as follows :

Structure definition:

struct Server  //define structure server.

{

string manufacturer;

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string model, serialnum;  //define string variable.

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 //define integer variable.

double clockSpeed;

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Explanation:

Structure is a collection of heterogeneous(different type) elements. It is a user-define datatype which is available on the C/C++ programming language. To define any structure we use the struct keyword. The syntax of defining structure can be given as:

Syntax:

struct structure name

{

//define variables

//statements and code.

};

OR

struct structure name

{

//define variables

//statements and code.

}create structure variable;  

In the above structure code, we define a structure that is "Server". In this structure, we define different types of variables that is " manufacturer, model, serialnum, year, clockSpeed, cores, ram, and storage". In this structure variable manufacturer, model and serialnum datatype are a string and clockSpeed datatype is double and variable year, cores, ram, and storage data type is an integer.

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Explanation:

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answer:

navigational search queries · for example, “how to make cake?”

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explanation:

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