postgresql-table-design

Design schemas following normalization rules up to 3NF, use appropriate data types for each column, apply NOT NULL constraints with defaults, and define explicit foreign keys with indexes. This foundation reduces costly refactors by encoding best practices upfront.

Choose data types that match your data (integers for IDs, text for strings, timestamps for dates), apply NOT NULL constraints where values are required, set sensible defaults, and use CHECK constraints to enforce domain rules. Proper typing prevents silent bugs and improves query performance.

Index primary keys automatically; explicitly index foreign keys to speed joins, index frequently queried columns like user_id or order_date, and consider MVCC storage implications for your workload. Strategic indexing accelerates reads without bloating writes.

Denormalize selectively after normalizing to 3NF when analytical workloads or repeated joins become bottlenecks. Denormalization trades write complexity for read speed; apply it only where profiling shows benefit, not preemptively.

Use serial or identity columns to auto-generate primary keys, or explicitly manage sequences for custom ID schemes. Identity columns simplify schema design and integrate cleanly with foreign key relationships.

Yes; OLTP schemas prioritize normalized writes with selective indexing on hot columns, while analytical schemas may denormalize for join reduction. Understand your workload mix before finalizing indexing and constraint strategy.