Languages & frameworks

SQL

Transactional data modeling, reporting queries, migrations, constraints, indexing, and reconciliation—the foundation for dependable business records.

PostgreSQL · MySQL · SQL Server

Discuss your project

Relationships are business rules

Customer

Key

customer_id  PRIMARY KEY

one → many

Order

Relationship

order_id     PRIMARY KEY
customer_id  FOREIGN KEY
status       NOT NULL

A database should express which records may exist and how they relate. Constraints protect the record model even when multiple applications or import jobs write to it. Reports become easier to reconcile when business definitions are explicit.

Make correctness visible before tuning

From slow report to a dependable query
Step	Evidence to collect
Agree the result	A reviewed sample with expected totals.
Inspect the query	Join behavior, filters, and the execution plan.
Tune deliberately	Indexes and query changes measured on realistic data.
Protect writes	Migration behavior, locks, and recovery procedure.

What makes a migration safe to release?

Test it with representative data volume and concurrent operations. Define how old and new application versions behave during rollout, and whether rollback requires restoring data or a forward correction.

Your project, scoped around the outcome