[Solved] In PostgreSQL full-text search, what does the ts_rank function primarily calculate? — Ans: The relevance score of a document based on a text search query | PostgreSQL

PostgreSQL - Full-Text Search

In PostgreSQL full-text search, what does the ts_rank function primarily calculate?

AThe frequency of a specific word in the database

BThe total number of words in a document

CThe length of the search query string

DThe relevance score of a document based on a text search query

Step-by-Step Solution

Solution:

Step 1: Understand ts_rank purpose
The ts_rank function computes a relevance ranking score for documents based on how well they match a full-text search query.
Step 2: Eliminate incorrect options
Options B, C, and D describe unrelated metrics (word count, query length, word frequency) which ts_rank does not calculate.
Final Answer:
The relevance score of a document based on a text search query -> Option D
Quick Check:
Does ts_rank measure relevance? Yes. [OK]

Quick Trick: ts_rank returns relevance score for text search matches [OK]

Common Mistakes:

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In PostgreSQL full-text search, what does the ts_rank function primarily calculate?