What other types of indexes do you know?

In addition to standard B-Tree indexes, there are other types of indexes used in databases to optimize different types of queries:

• Hash indexes — effective for exact key searches but do not support range queries.
• Bitmap indexes — well suited for columns with low cardinality (e.g., gender, status).
• GiST (Generalized Search Tree) — versatile indexes used for full-text search, geospatial data, and other complex structures.
• SP-GiST — specialized indexes for spatial and other specific data.
• R-Tree — used for indexing geometric data and spatial queries.
• Full-text indexes — for fast text search.

The choice of index type depends on the nature of the data and the types of queries that need to be optimized.