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Learning PostgreSQL 10
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PostgreSQL provides a full text search capability, which is used to overcome SQL pattern matching operators, including LIKE
and ILIKE
, boosting the performance of the text search. For example, even though an index on text using the text_pattern_op
class is supported, this index cannot be used to match a non-anchored text search.
Another issue with the traditional LIKE
and ILIKE
operators is the ranking based on similarity and natural language linguistic support. The LIKE
and ILIKE
operators always evaluate a Boolean value: either as TRUE
or as FALSE
.
In addition to ranking and non-anchored text search support, PostgreSQL full text search provides many other features. Full text search supports dictionaries, so it can support language, such as synonyms.
The full text search is based on the tsvector
and tsquery
datatypes. Here, tsvector
represents a document in a normalized state and tsquery
represents the query.
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