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What does a foreign key in a table represent?

easy📝 Conceptual Q2 of 15
SQL - Table Relationships
What does a foreign key in a table represent?
AA way to delete data automatically
BA unique identifier for each row in the same table
CA column that stores only numbers
DA link to a primary key in another table
Step-by-Step Solution
Solution:

  1. Step 1: Define foreign key

    A foreign key is a column that points to a primary key in another table.

  2. Step 2: Match options

    A link to a primary key in another table correctly describes this relationship link.

  3. Final Answer:

    A link to a primary key in another table -> Option D

  4. Quick Check:

    Foreign key = Link to another table [OK]
Quick Trick: Foreign keys connect tables by referencing primary keys [OK]
Common Mistakes:
MISTAKES
  • Confusing foreign key with primary key
  • Thinking foreign key is for deleting data

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