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You wrote this query but it returns an error:

medium📝 Debug Q6 of 15
SQL - INNER JOIN
You wrote this query but it returns an error:
SELECT * FROM A JOIN B ON A.id = B.id WHERE B.value > 10;

What is a likely cause?
AThe ON clause is missing a join condition
BThe JOIN keyword is invalid syntax
CWHERE clause cannot be used with JOIN
DTable B is not defined or misspelled
Step-by-Step Solution
Solution:
  1. Step 1: Check table references

    If B is misspelled or missing, the query will error due to unknown table.
  2. Step 2: Validate syntax

    ON clause and WHERE clause are valid here; JOIN keyword is correct.
  3. Final Answer:

    Table B is not defined or misspelled -> Option D
  4. Quick Check:

    Unknown table causes join error [OK]
Quick Trick: Check table names carefully to avoid join errors [OK]
Common Mistakes:
MISTAKES
  • Assuming WHERE cannot be used with JOIN
  • Thinking ON clause is optional
  • Believing JOIN keyword is invalid

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