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In a relational database, what does a foreign key represent?

Practice Questions

Q1
In a relational database, what does a foreign key represent?
  1. A unique identifier for a table
  2. A reference to a primary key in another table
  3. An attribute of an entity
  4. A constraint on data types

Questions & Step-by-Step Solutions

In a relational database, what does a foreign key represent?
  • Step 1: Understand that a relational database is a way to organize data into tables.
  • Step 2: Know that each table has rows and columns, where rows represent individual records and columns represent attributes of those records.
  • Step 3: A foreign key is a special type of column in one table.
  • Step 4: This foreign key links to the primary key of another table.
  • Step 5: The primary key is a unique identifier for each row in its own table.
  • Step 6: The foreign key helps to establish a relationship between the two tables.
  • Step 7: This means that the foreign key in one table points to a specific row in another table.
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