What step should be taken when designing a relational database?
The design process consists of the following steps:
- Determine the purpose of your database.
- Find and organize the information required.
- Divide the information into tables.
- Turn information items into columns.
- Specify primary keys.
- Set up the table relationships.
- Refine your design.
- Apply the normalization rules.
What step should be taken when designing a relational database when a many to many relationships exists?
What step should be taken when designing a relational database when a many-to-many relationships exists? Create two one-to-many relationships. One-to-one relationships are implemented by creating a linking table.
What is pure fabrication?
A pure fabrication is a class that does not represent a concept in the problem domain, specially made up to achieve low coupling, high cohesion, and the reuse potential thereof derived (when a solution presented by the information expert pattern does not).
What does the SRP mean for a class?
The SRP is about encapsulating logic and data in a class because they fit well together. Fit well means that the class is cohesive in the sense that most methods use most fields. Actually cohesion of a class can be measured with the Lack of Cohesion Of Methods (LCOM) metric.
What happens if you don’t adhere to SRP?
On the other hand, not adhering to SRP usually leads to the God class phenomenon: a class that knows too much and does too much.
What makes a table in a relational database relational?
Which to use depends on the nature of your data — what is important is that every table has a primary key, it must be unique and it cannot be NULL. What makes a relational database relational is, you might not be surprised to learn, the relations between the data stored in the tables.
What does cardinality of relationship mean in relational database?
This means we have a 1-to-N relationship between these entities — a brand may have N products associated with it (N just meaning any number), a product may have 1 brand associated with it. This attribute of the relationship, how many other entities an entity can have a relationship with, is known as the cardinality of the relationship.