What is a primary key example?
- What are the 5 types of primary key?
- What is primary and foreign key with example?
- What are the primary keys?
- What is the example of foreign key?
What are the 5 types of primary key?
Primary Key.Candidate Key.Alternate Key.Super Key.Composite Key.Foreign Key.Unique Key.Types of Keys in Database Management System
What is primary and foreign key with example?
A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table. The table with the foreign key is called the child table, and the table with the primary key is called the referenced or parent table.
What are the primary keys?
A primary key is the column or columns that contain values that uniquely identify each row in a table. A primary key is needed: To extract or archive data from a table that is visited more than once during a process (for example, a child table that has two or more parent tables referenced in the Access Definition).
What is the example of foreign key?
In simpler words, a foreign key is a set of attributes that references a candidate key. For example, a table called TEAM may have an attribute, MEMBER_NAME, which is a foreign key referencing a candidate key, PERSON_NAME, in the PERSON table.
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