Which of the following keys is generally used to represents the relationships between the tables?a.Primary keyb.Foreign keyc.None of the aboved.Secondary key
Question
Which of the following keys is generally used to represents the relationships between the tables?
a. Primary key
b. Foreign key
c. None of the above
d. Secondary key
Solution
The key that is generally used to represent the relationships between tables is the Foreign key (b).
Here's why:
a. Primary Key: This is a unique identifier for a record in a table. It must contain unique values and cannot be null.
b. Foreign Key: This is a field (or collection of fields) in one table, that is used to link two tables together. A Foreign Key in one table points to a Primary Key in another table. Hence, it is used to represent relationships between tables.
c. None of the above: This option is incorrect as the Foreign Key does represent relationships between tables.
d. Secondary Key: This is used mainly for data retrieval purposes. It is not specifically used to represent relationships between tables.
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