SQL query with nested JOIN returns incorrect results

[qianheng-aws]

When using nested JOIN statements in SQL queries, the results are incorrect. For example:

SELECT * FROM table1 t1 JOIN table2 t2 ON t1.id = t2.id JOIN table3 t3 ON t2.id = t3.id

Returns duplicate rows that should not be present.

Expected behavior: Query should return correct joined results without duplicates.
Actual behavior: Duplicate rows appear in the result set.

[github-actions]

Possible Duplicate

Found 2 possible duplicate issue(s):

• Nested JOIN produces duplicate rows in query output #15 — Nested JOIN produces duplicate rows in query output
• SQL JOIN produces cartesian product instead of filtered results #13 — SQL JOIN produces cartesian product instead of filtered results

If this is not a duplicate:

• Add a comment on this issue, and the duplicate label will be removed automatically, or
• 👎 this comment to prevent auto-closure

Otherwise, this issue will be automatically closed in 7 days.

🤖 Generated with Claude Code