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
----


