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Identify the error in the following code snippet for loading data from a database:

medium📝 Debug Q14 of 15
LangChain - Document Loading
Identify the error in the following code snippet for loading data from a database:
loader = SQLDatabaseLoader(uri='postgresql://user:pass@localhost/db', query='SELECT * FROM')
data = loader.load()
AThe URI format is incorrect for PostgreSQL
BThe loader class name is misspelled
CThe load() method is missing parentheses
DThe SQL query is incomplete and will cause a syntax error
Step-by-Step Solution
Solution:

  1. Step 1: Check the SQL query syntax

    The query 'SELECT * FROM' is incomplete because it lacks a table name, causing a syntax error.

  2. Step 2: Verify other parts

    The URI format is correct, load() has parentheses, and class name is spelled correctly.

  3. Final Answer:

    The SQL query is incomplete and will cause a syntax error -> Option D

  4. Quick Check:

    Incomplete SQL query = syntax error [OK]
Quick Trick: Check SQL query completeness first [OK]
Common Mistakes:
  • Ignoring incomplete SQL query
  • Misreading URI format
  • Forgetting parentheses on load()

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