An application for testing programmers contains an initial question version and newer question versions, represented by the following schema:

TABLE questions
  childId INTEGER
  FOREIGN KEY (childId) REFERENCES questions(id)

The latest question version has childId set to NULL, other question versions will have childId set to the next version. Each question version can be a child of only one other question version.

Finish the findLatestVersion stored procedure so that it returns the latest question version.

See the example case for more details.

Database engine: MySQL

  •   Example case: Wrong answer
  •   Calling the procedure with the parent of the latest question: Wrong answer
  •   Calling the procedure with older question versions: Wrong answer

MySQL CTE Recursion Select New Public


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