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664. JOIN Condition with AND

Use AND to require multiple conditions for a valid JOIN match.

📘 Lesson 664 of 728 ⏱ 13 min 🎯 Intermediate

AND requires every specified JOIN condition to evaluate as TRUE before two rows are considered a match.

Multiple conditions can prevent false matches when one column alone is not sufficient.

Match records using both CustomerID and BranchID.

SQL 
SELECT
    c.CustomerName,
    a.AccountNumber
FROM Customers c
INNER JOIN Accounts a
    ON c.CustomerID = a.CustomerID
   AND c.BranchID = a.BranchID;

Used in composite keys, regional systems, financial records, and multi-dimensional relationships.

  • AND requires all conditions to match.
  • It is common with composite keys.
  • It can improve match accuracy.
  • Every condition should represent a valid business relationship.
  • Missing a condition can create false matches.
Why use AND in a JOIN?

It ensures that multiple required conditions are satisfied before rows are matched.

What happens if one AND condition is false?

The two rows do not qualify as a match.

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