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Which of the following best describes the result of a FULL OUTER JOIN when there are no matching rows between two tables?

easy📝 Conceptual Q2 of 15
SQL - Advanced Joins
Which of the following best describes the result of a FULL OUTER JOIN when there are no matching rows between two tables?
AThe result will be empty with zero rows.
BThe result will contain only rows from the left table.
CThe result will contain only rows from the right table.
DThe result will contain all rows from both tables with NULLs in unmatched columns.
Step-by-Step Solution
Solution:

  1. Step 1: Consider no matching rows scenario

    If no rows match between the two tables, FULL OUTER JOIN still returns all rows from both tables.

  2. Step 2: Understand NULL placement

    Columns from the opposite table will be NULL where no match exists.

  3. Final Answer:

    The result will contain all rows from both tables with NULLs in unmatched columns. -> Option D

  4. Quick Check:

    FULL OUTER JOIN no matches = C [OK]
Quick Trick: FULL OUTER JOIN shows all rows, fills NULLs where no match [OK]
Common Mistakes:
MISTAKES
  • Assuming no matches means empty result
  • Confusing with INNER JOIN behavior

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