Module Artifacts
Outlines the module's learning topics—covering SQL key concepts including primary keys, foreign keys, referential integrity, and candidate keys—to guide learners and instructors through the sequence of content they will study or teach.
A foundational reading that defines what keys are in relational databases, explains why they are essential for identifying and relating data, and serves as a conceptual starting point for learners before they study specific key types.
A reading that explains what primary keys are, their uniqueness and non-null requirements, how to define them in SQL, and how learners and instructors can use the concept as the basis for understanding row identification in table design.
A reading that covers how foreign keys link tables in a relational database, what referential integrity means, how foreign key constraints are declared in SQL, and how learners use this knowledge to design and maintain consistent multi-table databases.
A reading that defines candidate keys as any minimal column or column combination capable of uniquely identifying rows, explains the relationship between candidate keys and the chosen primary key, and helps learners understand the selection process in database design.
A reading that explains composite keys as primary keys made up of two or more columns, describes the real-world scenarios where they are necessary, and guides learners through how to define and use them in SQL table definitions.
A reading that defines surrogate keys as system-generated identifiers added when natural data provides no practical unique identifier, compares them to natural keys, and helps learners understand when and how to apply them in database design.
A reading that explains how SQL key constraints such as PRIMARY KEY, FOREIGN KEY, and UNIQUE are used to automatically enforce data integrity at the database level, intended to help learners understand constraint syntax and the errors that arise when constraints are violated.
A reading that explains how SQL key constraints such as PRIMARY KEY, FOREIGN KEY, and UNIQUE are used to automatically enforce data integrity at the database level, intended to help learners understand constraint syntax and the errors that arise when constraints are violated.