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What does the @@ operator do in PostgreSQL?

easy📝 Conceptual Q11 of 15
PostgreSQL - Full-Text Search

What does the @@ operator do in PostgreSQL?

AIt concatenates two text strings.
BIt compares two numeric values for equality.
CIt matches a text column against a full-text search query.
DIt checks if a value is NULL.
Step-by-Step Solution
Solution:

  1. Step 1: Understand the purpose of @@ operator

    The @@ operator is used in PostgreSQL for full-text search to match text columns against search queries.

  2. Step 2: Compare with other options

    Other options describe unrelated operations like numeric comparison, string concatenation, or NULL checks, which are not related to @@.

  3. Final Answer:

    It matches a text column against a full-text search query. -> Option C

  4. Quick Check:

    @@ = full-text match [OK]
Quick Trick: Remember: @@ is for full-text search matching [OK]
Common Mistakes:
  • Confusing @@ with equality operator =
  • Thinking @@ concatenates strings
  • Assuming @@ checks for NULL

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