This Answer collected from stackoverflow, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4. Tags: postgresql, case, conditional, plpgsql Answers: 1 Viewed 28,908 times. Note that you have to force a minimal length of 4 or so on the search string if you want that to be efficient. If the pattern contains no parenthesized subexpressions, then each row returned is a single-element text array containing the substring matching the whole pattern. If the pattern does not match, the function returns no rows. WHERE unaccent(doc) ILIKE unaccent('%joh%') The function can return no rows, one row, or multiple rows (see the g flag below). Then you can search like this: SELECT * FROM tab So you should create a trigram index: CREATE EXTENSION IF NOT EXISTS pg_trgm ĬREATE INDEX ON tab USING gin (unaccent(doc) gin_trgm_ops) See the ICU documentation for details and my article for a detailed discussion.īut your problem is that you want substring search. Or, equivalently (that syntax also works wil old ICU versions: CREATE COLLATION english_ci_ai ( I would be very grateful for any advice on how to finally deal with this type of problem.Ĭreating case and accent insensitive ICU collations is pretty simple: CREATE COLLATION english_ci_ai ( The postgreSQL CASE expression is a generic conditional expression, similar to if/else statements in other languages, where the CASE statement goes through.
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