联合3表mysql错误

Question

嗨开发人员我试图从表中获取数据＆＃34; etudiant＆＃34;在哪里＆＃34; etudiant＆＃34;和＃34; enseignant＆＃34;与表＃34;服务＆＃34;

具有相同的外键

SELECT
    *
FROM
    etudiant
INNER JOIN etservice et1 ON
    et1.id_service = enseigant.id_service
INNER JOIN etservice ON etservice.id_service = etudiant.id_service
WHERE
    1 = 1