Question: In a database, what does a \'foreign key\' do?
Options:
Links two tables together
Identifies a unique record
Stores large amounts of data
Indexes a table for faster access
Correct Answer: Links two tables together
Solution:
A foreign key links two tables together by referencing the primary key of another table.
In a database, what does a 'foreign key' do?
Practice Questions
Q1
In a database, what does a 'foreign key' do?
Links two tables together
Identifies a unique record
Stores large amounts of data
Indexes a table for faster access
Questions & Step-by-Step Solutions
In a database, what does a 'foreign key' do?
Correct Answer: A foreign key links two tables together by referencing the primary key of another table.
Step 1: Understand that a database is like a collection of tables that store information.
Step 2: Know that each table can have a 'primary key', which is a unique identifier for each record in that table.
Step 3: A 'foreign key' is a special column in one table that refers to the primary key of another table.
Step 4: This connection allows you to link related data from different tables together.
Step 5: For example, if you have a 'Customers' table and an 'Orders' table, the 'Orders' table can have a foreign key that links to the 'Customers' table to show which customer made each order.
Foreign Key – A foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table, establishing a relationship between the two tables.
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