This reading introduces Entity-Relationship (ER) diagrams and relational schemas as conceptual tools used before database construction begins, and learners read it to understand the foundational vocabulary and purpose of both artifacts before proceeding through the module.
Topics
This module covers 6 topics. Open a topic to see its subtopics.
Module Content
16 items.
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This reading explains how to convert strong entities and their attributes from an ER diagram into concrete relational tables with defined columns and primary keys, and learners use it to practice the most fundamental step of the ER-to-schema translation process.
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This reading covers how one-to-many relationships identified in an ER diagram are represented in a relational schema by placing a foreign key in the child table, and learners use it to understand the rules and decisions involved in implementing this common relationship pattern.
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This reading explains how many-to-many relationships between entities are handled by introducing a junction (associative) table that holds foreign keys referencing both related entities, and learners use it to understand how to correctly decompose and represent this relationship type in a relational schema.
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This reading describes what weak entities are, how they differ from strong entities, and how their dependency on a parent entity is captured in a relational schema through composite primary keys and foreign key constraints, guiding learners through this special-case mapping.
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This reading covers the post-translation process of checking a derived relational schema for errors such as missing tables, misnamed columns, and incorrect foreign keys, and learners or instructors use it to understand systematic techniques for validating and refining a schema before implementation.
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This reading covers the post-translation process of checking a derived relational schema for errors such as missing tables, misnamed columns, and incorrect foreign keys, and learners or instructors use it to understand systematic techniques for validating and refining a schema before implementation.
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An opening reading that defines Entity-Relationship diagrams and relational schemas, explaining how entities, attributes, and relationships form the blueprint learners will later convert into tables; use it to establish shared vocabulary before attempting any mapping.
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A lesson on the first mapping step — turning each strong entity into its own table, converting simple attributes into columns, and promoting the key attribute to primary key — with handling of composite and multivalued attributes; learners work through it to produce their first draft tables.
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An explanation of how one-to-many relationships (such as one department to many employees) are implemented by placing a foreign key on the 'many' side table, including guidance on participation constraints and null handling; used to practice the most common relationship conversion.
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A lesson showing why many-to-many relationships cannot be represented with a single foreign key and how to resolve them with a junction/associative table holding a composite primary key plus any relationship attributes; learners apply it to cases like students enrolling in courses.
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A reading on mapping weak entities that depend on an owner entity for identity, demonstrating how to build a composite primary key from the owner's key plus a partial key and how to enforce the identifying relationship; used when diagrams include dependents, line items, or similar subordinate entities.
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A quality-check lesson on reviewing a draft schema — confirming every entity and relationship is represented, every table has a valid primary key, every foreign key references an existing key, and redundancy is removed; instructors use it as a checklist before implementation.
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A consolidated single-page version of the entire module that strings together all six readings from ER diagram basics through schema validation; useful for review, printing, or searching the whole module's content at once.
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An interactive design-board exercise (COP 4708 Assignment 3) in which learners act as a consultant, using undo/redo and reset controls to transform a director's interview, four draft entities, and a set of functional dependencies into a constraint-satisfying database design.
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An interactive HTML-based design board application that provides a drag-and-drop or selection-based workspace for constructing and evaluating relational database schemas. The tool appears to support placing and organizing table structures, keys, and attributes, with visual feedback indicators (color-coded chips, check panels, and scoring) to guide learners through schema design tasks.