![]() These index types support the above-described similarity operators, and additionally support trigram-based index searches for LIKE, ILIKE, ~ and ~* queries. The pg_trgm module provides GiST and GIN index operator classes that allow you to create an index over a text column for the purpose of very fast similarity searches. Thus, the number of additional characters present in the second string is not considered, except for the mismatched word boundaries. However, this function does not add padding to the boundaries of the extent. This function returns a value that can be approximately understood as the greatest similarity between the first string and any substring of the second string. In the first string, the set of trigrams is, and the similarity is 0.8. # SELECT word_similarity('word', 'two words') Returns the same value passed in ( deprecated). The threshold must be between 0 and 1 (default is 0.3). Sets the current similarity threshold that is used by the % operator. ![]() This sets the minimum similarity between two words for them to be considered similar enough to be misspellings of each other, for example ( deprecated). Returns the current similarity threshold used by the % operator. Returns a number that indicates the greatest similarity between the set of trigrams in the first string and any continuous extent of an ordered set of trigrams in the second string. (In practice this is seldom useful except for debugging.) Returns an array of all the trigrams in the given string. The range of the result is zero (indicating that the two strings are completely dissimilar) to one (indicating that the two strings are identical). Returns a number that indicates how similar the two arguments are.
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