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- Understanding the Anatomy of Complex Database Assignments
- The Four Pillars of a Typical SQL-Based Project
- From Prompt to ER Diagram: Decoding Business Logic
- Parsing the Project Spec Like a Pro
- Translating the Model to SQL: Building and Populating the Schema
- Writing SQL DDL (createTables.sql / dropTables.sql)
- Data Loading Is Where Things Break
- Creating Views: The Final Act
- 🔍 Rebuilding Public Tables Using Views
- Final Tips and Gotchas from Fakebook’s Blueprint
- Expect Interdependent Failures
- Use Autograder Wisely
- Clean and Modular Code
- Conclusion: From Fakebook to Facebook
Database design assignments like the “Fakebook” project from EECS 484 are more than just academic tasks—they’re a crash course in real-world systems. But let’s be honest: even the best students have hit a wall trying to make sense of createTables.sql
, wondering why the Autograder keeps failing. If you've ever found yourself typing "do my programming assignment" into Google at 2 AM, you're not alone. These projects look simple on the surface—design an ER diagram, write some SQL, load some data—but the depth of detail, constraint logic, and debugging involved can be overwhelming. Whether you're wrestling with foreign key constraints, deciphering circular dependencies, or creating triggers that won’t trip the Autograder, it’s easy to feel stuck. That’s where having a Database Assignment Helper (or a guide like this one) can make a massive difference. We’re not here to give you the answers, but we will give you a structured, actionable way to break down and master assignments like Fakebook. From interpreting specs to writing clean SQL scripts and handling tricky triggers, we’ll walk you through how to approach, debug, and succeed—without needing to scream into the void.
Understanding the Anatomy of Complex Database Assignments
Relational database assignments often follow a pattern, and understanding this structure gives you a clear roadmap for success.
The Four Pillars of a Typical SQL-Based Project
While each project has a unique theme, like Fakebook’s fictional social media platform, most are structured around these components:
- Entity-Relationship (ER) Diagram Design
This is where you interpret a verbose real-world scenario (e.g., users, events, friendships) and translate it into a logical database model.
In Fakebook, for example:
- A User has personal data, lives in a City, and attends Programs.
- Users form friendships (a symmetric relationship).
- Users create albums that contain photos where they can be tagged.
- Events exist that users can join.
Your ER diagram must capture entities, attributes, primary keys, foreign keys, and cardinality. But more subtly, you must also capture constraints that SQL can’t enforce directly — like “a photo must belong to one album” or “an album must have at least one photo.”
- Schema Implementation via DDL
Next comes creating actual tables (
createTables.sql
) and dropping them (dropTables.sql
) using Data Definition Language (DDL). You’ll be expected to reflect your ER diagram precisely in SQL code.The catch? The project may give you a fixed schema for testing purposes, like in Fakebook. You’ll have to reverse-engineer the given schema into an ER diagram and reconcile it with your own.
- Data Loading via DML
You’ll use
loadData.sql
to read from a public (often poorly designed) dataset and insert into your well-designed tables.This is where students usually underestimate complexity. Mismatches in field naming, normalization, duplicates (like redundant friendship pairs), and NULLs in the public data are common tripwires.
- View Creation
To wrap things up, you’ll write
createViews.sql
to expose your tables in the same schema as the original public dataset (anddropViews.sql
to clean up). These views act as proof that your schema can reproduce the original structure while conforming to best practices.
Why Projects Like Fakebook Are Intentionally Frustrating:
These projects aren’t just about checking boxes. They simulate real-world database refactoring — dealing with poor data design, data transformation, schema enforcement, and logical consistency. They test:
- Your modeling skills
- Your ability to translate models into code
- Your attention to constraints
- Your SQL debugging stamina
From Prompt to ER Diagram: Decoding Business Logic
Creating the ER diagram is not just about boxes and lines — it’s where 50% of your project success is born. Let’s dissect how to do this effectively with Fakebook as a case study.
Parsing the Project Spec Like a Pro
- Look for Entities, Not Just Nouns
Don’t treat every noun as a new table. Instead, ask:
- Is this thing identifiable? (→ Entity)
- Is this thing a description of something else? (→ Attribute)
- Is this thing a relationship between two entities? (→ Relationship)
Example:
- User is an entity.
- City is an entity.
- Current City is a relationship between a user and a city.
- Map Relationships Carefully
Fakebook's friendships are bidirectional — (1, 2) = (2, 1). So a simple Friends table won’t cut it without a trigger or sorted pair enforcement.
Similarly, messages go from one user to another. This is a unidirectional relationship, and “sender” and “receiver” are distinct roles.
- Constraints Are Gold
Constraints in the prompt often determine:
- Whether you need composite primary keys
- If participation is total or partial
- Whether to create weak entities (e.g., Tags)
Key insight from Fakebook: The prompt explicitly says not to represent constraints that are impossible to show in ER diagrams — like mutual exclusivity. Focus on those you can show, like "one photo must belong to exactly one album."
Translating the Model to SQL: Building and Populating the Schema
Once your ER diagram is stable, it’s time to transition from theory to SQL files. This is where the rubber meets the road.
Writing SQL DDL (createTables.sql / dropTables.sql)
- Match the Schema Exactly
In Fakebook, the testing schema is rigid — column names, types, and order must match exactly.
Pro tip: Use the ER diagram to write your CREATE TABLE statements, but before finalizing them, adapt their structure to match the testing schema. This is reverse engineering in action.
- Handle Circular Dependencies
In Fakebook, Albums reference Photos (via
cover_photo_id
) and Photos reference Albums (viaalbum_id
). You can’t create both simultaneously with foreign keys.Solution: Use
ALTER TABLE
after creation to insert foreign keys:ALTERTABLE Albums ADDCONSTRAINTfk_cover_photoFOREIGN KEY (cover_photo_id) REFERENCES Photos(photo_id)INITIALLY DEFERRED DEFERRABLE;
- Create Sequences and Triggers
For ID fields that aren't supplied in the public dataset (like
city_id
), you’ll need to:- Create a
SEQUENCE
- Use a
TRIGGER
to auto-generate IDs on insert
Pro tip from Fakebook: Keep trigger/sequence names short or the Autograder will break.
- Create a
Data Loading Is Where Things Break
Once your schema is ready, loadData.sql
brings in actual data — often from an ugly legacy table.
- De-duplicate Friendships
Fakebook public data includes both (1, 2) and (2, 1). Your job is to SELECT only one using:
SELECTLEAST(user1_id, user2_id), GREATEST(user1_id, user2_id)FROM project1.Public_Are_Friends
- Normalize Programs
Fakebook uses (institution, concentration, degree) to define a unique program. But the public dataset repeats this combo per user.
You’ll need a DISTINCT selection into a Programs table, then join it to populate Education.
- Watch for NULLs and Multi-step Joins
For fields like
hometown_city
,program_year
, ortag_coordinates
, missing values may force you to insert conditionally or skip rows entirely.
Creating Views: The Final Act
Your schema is done, your data is in — now comes the proof.
🔍 Rebuilding Public Tables Using Views
Fakebook requires you to write views (View_User_Information
, View_Photo_Information
, etc.) that match the public dataset format exactly. That means:
- Column names must match
- Column order must match
- Field types must match
- Use MINUS Queries for Testing
To ensure your view replicates the original table:
SELECT * FROM project1.Public_User_InformationMINUSSELECT * FROM View_User_Information;This should return no rows. If it does — you’re missing or misaligning data.
- Handle Special Cases (e.g., View_Are_Friends)
Because you normalized friendships, your view must de-normalize them again — showing both (1,2) and (2,1). Use a UNION:
SELECT user1_id, user2_id FROM FriendsUNIONSELECT user2_id, user1_id FROM Friends;
Final Tips and Gotchas from Fakebook’s Blueprint
- Use
@createTables
,@loadData
, etc. for modular SQL execution. - Comment your scripts clearly.
- Use aliases and avoid hardcoding.
- Model carefully
- Match schemas exactly
- Normalize public data logically
- Validate using queries
- Always anticipate side effects
Expect Interdependent Failures
If one table fails to create, others depending on it will also break. Always test creation in sequence. Start with DROP, then CREATE, then LOAD.
Use Autograder Wisely
Fakebook allows only 3 feedback submissions per day. Test your scripts locally before burning submissions.
Clean and Modular Code
Conclusion: From Fakebook to Facebook
Assignments like Fakebook aren’t just practice — they’re miniaturized versions of real-world data engineering problems. If you can conquer this, you’re ready for production systems, migrations, and schema refactoring tasks in industry.
To succeed:
Treat each part like a component of a larger machine — because in databases, one broken gear can crash the whole engine.