Can a table be both parent and child?

Can a table be both parent and child?

Child tables and parent tables are just normal database tables, but they’re linked in a way that’s described by a parent–child relationship. It’s usually used to specify where one table’s value refers to the value in another table (usually a primary key of another table). For example, imagine a news article.

Which table is parent and which is child?

The referenced table is called the parent table while the table with the foreign key is called the child table. The foreign key in the child table will generally reference a primary key in the parent table. A foreign key can be created using either a CREATE TABLE statement or an ALTER TABLE statement.

How do you create a relationship between tables in Access?

Create a table relationship by using the Relationships window

  1. On the Database Tools tab, in the Relationships group, click Relationships.
  2. On the Design tab, in the Relationships group, click Add Tables (or Show Table in Access 2013).
  3. Select one or more tables or queries and then click Add.

What is parent/child relationship in database?

In database management, a relationship between two files. The parent file contains required data about a subject, such as employees and customers. The child is the offspring; for example, an order is the child to the customer, who is the parent.

How do you control the data in the child table when there is a change in the parent table?

3 Answers

  1. Get rid of the “status” flag and use “begin” and “end” dates.
  2. Both the begin and end date columns should be defined as “NOT NULL” and begin should have a default constraint of GETDATE() or CURRENT_TIMESTAMP.
  3. I would suggest adding a trigger to the following:

What is the relationship between parents and child?

The Parent-Child Relationship is one that nurtures the physical, emotional and social development of the child. It is a unique bond that every child and parent will can enjoy and nurture. This relationship lays the foundation for the child’s personality, life choices and overall behaviour.

What is parent/child relation in database?

Which of the following database is allows only a parent child relationship?

Parent child relationship is established in Hierarchical database Models.

Which type of database has multiple tables with parent/child relationships and a child that can have more than one parent?

Network database models
Network database models also have a hierarchical structure. However, instead of using a single-parent tree hierarchy, this model supports many to many relationships, as child tables can have more than one parent. See more on network databases .