Under what circumstances are composite primary keys appropriate?

1 answer:

8 0

A composite primary key is a set of several primary keys that, together, uniquely identifies each record.
Primary keys are used as identifiers of composite entities. In this case each primary key combination is allowed only once in the *:* relationship.
Other case where primary keys are used is as identifiers of weak entities, where the weak entity has a strong identifying relationship with the parent entity.

You might be interested in

A system analyst generally needs to have a number of skills. For example, technical and analytical skills are required for this

polet [3.4K]

Answer: See explanation

Explanation:

Systems analysts are the people who analyse how a particular software, or IT system will be able to fit and meet the needs of their company or client. They are charged with the responsibility of writing requirements for new systems.

Some if the skills required for a system analyst include:

• Flexibility

• Strong analytical skills

• Adaptability

• Initiative

• Interpersonal skills.

• Attention to detail.

• Teamwork skills.

• Written and verbal communication skills.

8 0

3 years ago

1. The running configuration is also known as the _____________ (Select Two) a. Startup config b. Working configuration c. Curre

Shtirlitz [24]

Answer:

1. The running configuration is also known as the b. working configuration

c. current configuration

Explanation:

hopes this help (:

6 0

2 years ago

What is the Way to keep the tool Screw

Verizon [17]

What does that even mean? is this a poem?

7 0

2 years ago

I wrote a program to calculate how many unique students I have taught over the years. It will read in a file formatted with firs

weqwewe [10]

This question is incomplete. The complete question, answer & explanation for this question is given in the attachment below.

Download docx

4 0

3 years ago

Which SQL keyword is used to search for records?

Over [174]

SQL (Structured Query Language.) is the standard programming language for communicating and organizing databases (DB).
In order to search through the database the statement SELECT should be used.
SELECT select data from the database.
SELECT is followed by the statement FROM which defines from which database you search record.

8 0

3 years ago