-- Suggested testing environment: 
-- https://www.db-fiddle.com/ with MySQL version set to 8

-- Example case create statement:
CREATE TABLE questions (
    id INTEGER NOT NULL PRIMARY KEY,
    name VARCHAR(50) NOT NULL,
    childId INTEGER,
    FOREIGN KEY (childId) REFERENCES questions(id)
);

INSERT INTO questions (id, name, childId) VALUES 
                      (3, 'SQL select v3', NULL),
                      (2, 'C# tuples', NULL),
                      (1, 'SQL select v2', 3),
                      (0, 'SQL select', 1);					 
DELIMITER //
CREATE PROCEDURE findLatestVersion(
    IN questionId INTEGER
)
BEGIN
    -- Write your code here
END;
//
DELIMITER ;

-- Example case:
CALL findLatestVersion(0)
-- Expected output (in any order):
-- 3