It is a term from computer databases. A relational database can have a one-to-many relationship in its data. For example, if you have a customer order database, one table will contain customer names and another will contain their orders. Each customer will only be listed once, but each customer can make many orders. So one customer can be related to many orders. Incorporating that into a database requires the creation of a one to many relationship.
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There are three types of relationships in the database. The 3 types of relationships are one to one , one to many and many to many. In one to one , one entity can be related to one entity only .
A linear relationship is one where your equation forms a straight line. A positive linear relationship is one where this line has a positive gradient.
It depends on what kind of relationship. If it's business wise, then it can describe a relationship between products and sales. If it is mathematics wise, then it can be used to describe a relationship by showing the differences and similarities of different products.
Positive Linear Relationships are is there is a relationship in the situation. In some equations they aren't linear, but other relationships are, that's a positive linear Relationship.
no relationship
i am not sure. it seems that casual relationship compares between to things where there is no relationship and no sense. just is. on the other hand, an actual relationship does make sense. both these phrases mean the the same thing: comparing 2 different independent and dependent variables. it's just that casual relationship is inconsistent and makes no sense.