SELECT
au_employee. ID,

POSTALCODE,
AU_EMPLOYEE.REMARK,
ENABLE_STATUS,
ENABLE_DATE,
AU_EMPLOYEE.CREATE_DATE,
MODIFY_DATE 

FROM
AU_EMPLOYEE
LEFT JOIN BAS_SCHOOL school ON school.SCHOOL_ID = AU_EMPLOYEE.COLUMN1
LEFT JOIN AU_POSITION position ON position. ID = AU_EMPLOYEE.POSITION_ID

WHERE
au_employee. ID =1

MODIFY_DATE 在表AU_EMPLOYEE和表AU_POSITION都存在 ，在两个不同的库里，一个可以正常运行，一个报 [Err] ORA-00918: 未明确定义列