Which is a valid reason to use a composite PRIMARY KEY?

Problem Statement

Explanation

Composite keys model identities like (order_id, line_no) or (country_code, phone). They encode business meaning and enforce pair uniqueness. They do add key width to child tables. Consider a surrogate key if many foreign keys must reference the row.

Code Solution

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PRIMARY KEY (order_id, line_no)

Practice Sets

This question appears in the following practice sets:

Constraints, Keys & Data Integrity

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Which is a valid reason to use a composite PRIMARY KEY?

Problem Statement

Explanation

Code Solution

Practice Sets

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Master Interviews Anywhere, Anytime

Which is a valid reason to use a composite PRIMARY KEY?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

Which clause filters rows before aggregation and affects which rows are grouped?

What is the default sort order when ORDER BY is used without ASC or DESC?

Which construct is commonly used to paginate results in SQL engines like Postgres and MySQL?

Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews
Anywhere, Anytime