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How can you efficiently retrieve all feedback comments annotated as 'negative' without scanning the entire table?

hard📝 Application Q9 of 15
LangChain - LangSmith Observability
How can you efficiently retrieve all feedback comments annotated as 'negative' without scanning the entire table?
ACreate an index on the sentiment column
BUse SELECT * without WHERE clause
CStore negative comments in a separate table
DRun a full table scan every time
Step-by-Step Solution
Solution:

  1. Step 1: Understand indexing purpose

    Indexing a column speeds up queries filtering by that column.

  2. Step 2: Check other options

    SELECT * without filter returns all rows; separate table duplicates data; full scan is slow.

  3. Final Answer:

    Create an index on the sentiment column -> Option A

  4. Quick Check:

    Indexing speeds filtered queries [OK]
Quick Trick: Index columns used in WHERE for faster queries [OK]
Common Mistakes:
MISTAKES
  • Ignoring indexes
  • Using full scans unnecessarily
  • Duplicating data in separate tables

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