Question

1. which statements define primary keys and foreign keys and describe their relationship? select all that apply.

□ a primary key is a table containing observational data, and a foreign key is a table that contains the results of the primary key’s analysis.
□ a foreign key is a field within a table that’s a primary key in another table.
□ a primary key is an identifier that references a column in which each value is unique.
□ primary and foreign keys are two connected identifiers within separate tables in a relational database.

Explanation:

• A primary key is a unique identifier for records in a table, so each value must be unique.
• A foreign key is a field in one table that matches the primary key of another table, creating a relationship between them.
• Primary and foreign keys work together to link separate tables in a relational database.
• The first option incorrectly describes primary/foreign keys as tables, which is not accurate.

Answer:

□ A foreign key is a field within a table that's a primary key in another table.
□ A primary key is an identifier that references a column in which each value is unique.
□ Primary and foreign keys are two connected identifiers within separate tables in a relational database.