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You want to find all products and their sales, including products with no sales, and also include sales with no matching product. Which join should you use?

hard📝 Application Q9 of 15
SQL - LEFT and RIGHT JOIN
You want to find all products and their sales, including products with no sales, and also include sales with no matching product. Which join should you use?
AINNER JOIN
BLEFT OUTER JOIN
CFULL OUTER JOIN
DRIGHT OUTER JOIN
Step-by-Step Solution
Solution:

  1. Step 1: Understand join requirements

    Include all products (even without sales) and all sales (even without products).

  2. Step 2: Identify join type

    FULL OUTER JOIN returns all rows from both tables, matching where possible, NULL otherwise.

  3. Final Answer:

    FULL OUTER JOIN -> Option C

  4. Quick Check:

    FULL OUTER JOIN includes unmatched rows from both tables [OK]
Quick Trick: FULL OUTER JOIN keeps unmatched rows from both tables [OK]
Common Mistakes:
MISTAKES
  • Using LEFT or RIGHT JOIN excludes unmatched rows from one side
  • Using INNER JOIN excludes unmatched rows
  • Confusing FULL OUTER JOIN with CROSS JOIN

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