A Full-Text Index breaks text data into words (tokens) and indexes them for fast keyword and phrase searches, enabling efficient text search beyond simple exact matches or prefix queries.
A Unique Index enforces distinct values in a column, preventing duplicates while speeding up queries. It's ideal for fields like email or username, ensuring data accuracy with minimal impact on read performance.
A Primary Index is an automatic, unique index created on a table's primary key for fast data retrieval. It ensures quick lookups, enforces uniqueness, and boosts performance in relational databases.