Same the title : What is the Index – Normal – FullText – Unique ?
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A normal index is used to speed up operation by only containing a slice or hash of the row’s data.
A fulltext index indicates to the database’s fulltext search (FTS) engine that it should archive the data within the given fields for quicker searching through large volumes of text.
A unique index is similar to a normal index, but also imposes upon the database that the specific combination of fields within the index will be unique across the entire table.