Posts in: Databases

Primary, Unique, Foreign Keys

Learn how to define PRIMARY KEY, UNIQUE, and FOREIGN KEY constraints to maintain relational integrity.

Use CHECK to enforce conditions on column values and DEFAULT to provide fallback values.

Understand what indexes are and how they improve performance in Oracle SQL by speeding up data retrieval.

Explore various index types like B-tree, bitmap, and unique indexes to understand their purpose and use cases.

Use function-based indexes for expressions and invisible indexes for testing or optimization without affecting application queries.