Database Assignment Help — SQL, ER Diagrams, Normalisation & NoSQL

Database Topics We Cover

Conceptual & Logical Design	SQL & Implementation	Advanced Topics
Entity-relationship (ER) diagrams	SELECT, WHERE, JOIN, GROUP BY, HAVING	Transaction management and ACID
Extended ER (EER) — specialisation, generalisation	Subqueries and correlated subqueries	Concurrency control (locking, MVCC)
Relational schema mapping from ER	Window functions (RANK, ROW_NUMBER, LAG)	Indexing and query optimisation
Normalisation (1NF, 2NF, 3NF, BCNF)	Stored procedures and triggers	Distributed databases and CAP theorem
Functional dependencies and closure	Views and materialised views	NoSQL (MongoDB, Cassandra, Redis)
Relational algebra (select, project, join, divide)	DDL (CREATE, ALTER, constraints)	Graph databases (Neo4j)

What Database Assignments Typically Require

ER diagram: entities, attributes (simple, composite, multivalued, derived), relationships with cardinality (1:1, 1:N, M:N) and participation constraints — drawn to the notation specified (Chen, crow's foot, UML)
Relational schema: converting ER to tables with primary keys, foreign keys, and handling of M:N relationships (junction tables)
Normalisation: identifying functional dependencies, finding the candidate keys, verifying or achieving 3NF/BCNF — with formal decomposition steps shown
SQL queries: correct, tested queries that produce the specified output — complex joins, aggregation, subqueries, window functions
Written analysis: justification of design decisions, comparison of relational vs NoSQL for a given use case, transaction isolation level selection

Normalisation requires showing functional dependencies explicitly. Stating "this table is in 3NF" without listing the FDs and proving no transitive dependencies exist earns partial credit at best. Write out F = {A→BC, C→D, …}, find the candidate keys, then test each normal form condition against each FD.

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Frequently Asked Questions

Which SQL dialects do you work in?

MySQL, PostgreSQL, SQLite, Oracle SQL, and Microsoft T-SQL. Most standard SQL is dialect-neutral, but syntax differences exist for string functions, date handling, window functions, and CTEs. Specify your database system in your brief and we use the correct syntax and test with that engine.

Can you draw ER diagrams in a specific notation?

Yes. Chen notation, crow's foot (Martin notation), and UML class diagram notation are all used in different textbooks and institutions. Specify which notation your module uses and we draw the diagram accordingly. Diagrams are delivered as high-resolution images (PNG/SVG/PDF) created with draw.io, Lucidchart, or equivalent tools.

Do you help with NoSQL database assignments?

Yes. MongoDB (document model, aggregation pipeline, schema design), Redis (key-value, caching patterns), Cassandra (wide-column, partition keys), and Neo4j (graph model, Cypher queries) are all handled. Specify the NoSQL system and the type of assignment (query writing, schema design, comparison essay) and we work accordingly.