[Solved] Why does this query cause an error?SELECT * FROM docs WHERE to_tsvector(content) @@ 'database'; — Ans: The right side must be a tsquery, not a plain string | PostgreSQL

PostgreSQL - Full-Text Search

Why does this query cause an error?

SELECT * FROM docs WHERE to_tsvector(content) @@ 'database';

AThe right side must be a tsquery, not a plain string

Bto_tsvector cannot be used in WHERE clause

CThe content column must be cast to text first

DThe @@ operator requires numeric operands

Step-by-Step Solution

Solution:

Step 1: Understand @@ operator requirements
The right operand must be a tsquery, not a plain string.
Step 2: Identify the error cause
Using a plain string causes a type error; to_tsquery('database') is needed.
Final Answer:
The right side must be a tsquery, not a plain string -> Option A
Quick Check:
@@ operator requires tsquery right operand = A [OK]

Quick Trick: Use to_tsquery() for search terms, not plain strings [OK]

Common Mistakes:

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Why does this query cause an error?