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What is the main difference between an equi join and a non-equi join in SQL?

easy📝 Conceptual Q1 of 15
SQL - Advanced Joins
What is the main difference between an equi join and a non-equi join in SQL?
AEqui joins require tables to have the same number of rows.
BNon-equi joins use comparison operators other than '=' in the join condition.
CNon-equi joins only work with numeric columns.
DEqui joins always return more rows than non-equi joins.
Step-by-Step Solution
Solution:

  1. Step 1: Understand equi join condition

    Equi joins use the '=' operator to match rows between tables.

  2. Step 2: Understand non-equi join condition

    Non-equi joins use other comparison operators like <, >, <=, >=, or BETWEEN.

  3. Final Answer:

    Non-equi joins use comparison operators other than '=' in the join condition. -> Option B

  4. Quick Check:

    Non-equi join condition = comparison operators other than '=' [OK]
Quick Trick: Non-equi joins use <, >, <=, >= instead of = [OK]
Common Mistakes:
MISTAKES
  • Thinking non-equi joins only work with numbers
  • Confusing equi join with non-equi join conditions
  • Assuming non-equi joins always return fewer rows

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