How to perform case-insensitive string matching with ILIKE in ClickHouse ®

The guide provides a detailed exploration of implementing case-insensitive text searches in ClickHouse using the ILIKE operator, which is essential for matching results regardless of capitalization. It explains the use of wildcards for flexible search patterns, compares the ILIKE operator with its function form, and discusses performance considerations, such as using specialized indexes like ngrambf_v1 to speed up searches on large datasets. Additionally, it covers the nuances of handling special characters and UTF-8 case folding for international characters. The document also highlights common pitfalls that can slow down ILIKE queries and offers solutions, such as avoiding leading wildcards and ensuring proper data type usage. Moreover, it guides on building a parameterized search API using Tinybird's managed ClickHouse platform, showcasing steps from data ingestion to API deployment, thus simplifying the process of deploying real-time search features without extensive infrastructure management.

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