rspec/rules/S3640/rule.adoc

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Sometimes a join through table B is required to get from table A to table C. But when the table B join values are present in A and C, and nothing else from B is used in the query, the join to B can be eliminated, thereby improving performance and enhancing code clarity.
== Noncompliant Code Example
----
SELECT A.name, C.department
FROM A
JOIN B ON A.c_id=B.c_id -- Noncompliant; redundant
JOIN C on B.c_id = C.c_id
WHERE A.id = 12
----
== Compliant Solution
----
SELECT A.name, C.department
FROM A
JOIN C on A.c_id = C.c_id
WHERE A.id = 12
----