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Ranking search results using multiple fields in PostgreSQL fulltext search

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Hi,
is there a way to rank the search results based on multiple fields in postgreSQL?
For example,
i have title, abstract, summary, body as fields/columns in my database. When user searches on title, i want to rank the results based on title field as well as summary field, where importance(summary) > importance(title). But the results should be exactly matching the terms in "title" rather than "title" OR "summary"



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