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Consider the tables:

medium📝 query result Q4 of 15
SQL - Advanced Joins
Consider the tables:
Animals with rows: Dog, Cat
Colors with rows: Black, White
What will be the output of:
SELECT Animals.name, Colors.color FROM Animals CROSS JOIN Colors;
AAll possible pairs of animal names and colors.
BOnly animals that have the same name as a color.
COnly animals with color 'Black'.
DAn error due to missing JOIN condition.
Step-by-Step Solution
Solution:
  1. Step 1: Understand CROSS JOIN output

    The CROSS JOIN returns the Cartesian product, pairing each animal with every color.
  2. Step 2: Analyze the options

    All possible pairs of animal names and colors. correctly describes the output. Options B and C describe filtered results, which CROSS JOIN does not do. An error due to missing JOIN condition. is incorrect as CROSS JOIN does not require a condition.
  3. Final Answer:

    All possible pairs of animal names and colors. -> Option A
  4. Quick Check:

    CROSS JOIN pairs all rows without filtering [OK]
Quick Trick: CROSS JOIN returns all combinations [OK]
Common Mistakes:
MISTAKES
  • Assuming CROSS JOIN filters rows
  • Expecting a join condition for CROSS JOIN
  • Confusing CROSS JOIN with INNER JOIN

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