???????????????JDBC?????????????????????

-- ????????????
SELECT *
FROM
{oj Countries LEFT OUTER JOIN Cities ON 
   (Countries.country_ISO_code=Cities.country_ISO_code)}
-- ??????????????????
SELECT *
FROM
{oj Countries JOIN Cities ON (Countries.country_ISO_code=Cities.country_ISO_code)}
-- ????????????????????????????????????????????????
-- FROM???????????????????????????????????????????????????
SELECT E.EMPNO, E.LASTNAME, M.EMPNO, M.LASTNAME
FROM {oj EMPLOYEE E INNER JOIN DEPARTMENT
INNER JOIN EMPLOYEE M ON MGRNO = M.EMPNO ON E.WORKDEPT = DEPTNO};