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What is a key risk when using NATURAL JOIN in SQL?

easy📝 Conceptual Q1 of 15
SQL - Advanced Joins
What is a key risk when using NATURAL JOIN in SQL?
AIt may join tables on unintended columns with the same name
BIt requires explicit join conditions to work
CIt only works with numeric columns
DIt always returns all columns from both tables
Step-by-Step Solution
Solution:

  1. Step 1: Understand how NATURAL JOIN works

    NATURAL JOIN automatically joins tables using all columns with the same name.

  2. Step 2: Identify the risk of unintended joins

    If tables share column names that are not meant to be join keys, NATURAL JOIN will still join on them, causing incorrect results.

  3. Final Answer:

    It may join tables on unintended columns with the same name -> Option A

  4. Quick Check:

    Risk of NATURAL JOIN = unintended column joins [OK]
Quick Trick: NATURAL JOIN matches all same-named columns automatically [OK]
Common Mistakes:
MISTAKES
  • Thinking NATURAL JOIN needs explicit ON clause
  • Assuming NATURAL JOIN only works on numeric columns
  • Believing NATURAL JOIN always returns all columns without duplicates

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