Translating an ER diagram into tables is only half the job. Once you have a draft schema, you need to review it deliberately: does every entity and relationship in the diagram appear somewhere in the tables? Does every table have a primary key that truly identifies one row? Does every foreign key point at an existing primary key, with a sensible rule for what happens on update or delete? Validation is the step where modeling mistakes are cheapest to fix — before data is loaded and before application code depends on the structure.
This topic walks through a repeatable review process: cross-check tables against ER entities and relationships, verify primary key integrity (including composite keys for junction tables and weak entities), validate foreign key constraints and referential integrity, enforce consistent naming conventions, apply normalization checks (typically through 3NF, sometimes BCNF), confirm that domain, NOT NULL, UNIQUE, and CHECK constraints are all present, and then iterate until the schema is stable.
As you watch the videos below, keep a draft schema in front of you and treat each one as a checklist source. In the first video, note which mistakes are detectable by inspecting a schema alone. In the normalization videos, focus on how you test a table for a given normal form rather than on memorizing definitions — the goal is to be able to look at one of your own tables and say precisely which dependency violates which rule, and how to decompose it.
Database Star reviews several common database design mistakes and, for each one, explains the problem and a recommended fix. Based on the title and description, expect issues such as poor key choices, inconsistent or unclear naming, storing multiple values in one column, and missing or misused constraints — exactly the kinds of defects a schema review is meant to catch.
It frames schema review as a practical checklist rather than theory, which maps directly onto the cross-checking, naming convention, and integrity constraint subtopics; Database Star is a well-known, design-focused channel aimed at practitioners.
Gate Smashers surveys the normal forms in a single pass — 1NF, 2NF, 3NF, BCNF, 4NF and 5NF — using real-life style examples to show what each form requires and what violating it looks like. It is a fast, exam-oriented overview that lets you place your tables on the normalization ladder.
It gives you the full vocabulary and the test for each normal form in one compact video, which is what you need when applying normalization checks to a finished schema; the channel is widely used for DBMS coursework and keeps definitions crisp.
Decomplexify provides a detailed, example-driven explanation of Boyce-Codd Normal Form: what functional dependencies and candidate keys are, when a table in 3NF still violates BCNF, and how to decompose it. The pacing is slower and more conceptual than a survey video.
BCNF is where subtle key problems surface, so this is strong support for verifying primary key integrity and refining tables; Decomplexify is known for unusually clear, carefully worked explanations of normalization.
Together these videos support the evaluation step of the module. The design-mistakes video reinforces MO1 through MO4 indirectly by showing what incorrect table structures, keys, and column assignments look like in practice, and it directly supports naming and constraint checks. The two normalization videos target MO5: the Gate Smashers overview gives you the test for each normal form so you can confirm your schema reaches 3NF, while the Decomplexify BCNF video sharpens your understanding of functional dependencies and candidate keys, which is what makes primary key and foreign key verification rigorous rather than superficial. Use all three as review tools against a schema you have already derived from an ER diagram.
These videos were chosen from YouTube on October 2, 2026. Each has captions; the player turns them on. Videos on YouTube can be changed or removed — if one no longer plays, tell your instructor. If a player does not appear, use its Watch on YouTube link.