SELECT t1.*
FROM employees t1
INNER JOIN (
SELECT id, max(job_start) AS job_start FROM employees GROUP BY id
) t2 ON t1.id = t2.id AND t1.job_start = t2.job_start;
SELECT *
FROM situation
WHERE datevenement = (SELECT MAX(datevenement)
FROM situation
WHERE matricule = 12)
AND matri = 12;