请说明原因,1.SELECTA.FIRST_NAME FROM EMPLOYEES A LEFT JOIN EMPLOYEES B ON A.EMPLOYEE_ID=B.MANAGER_ID WHERE B.FIRST_NAME ='David' 2.SELECT A.FIRST_NAME FROM EMPLOYEES A ,EMPLOYEES B WHERE A.EMPLOYEE_ID=B.MANAGER_ID AND B.FIRST_NAME ='David'

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请说明原因,1.SELECTA.FIRST_NAME FROM EMPLOYEES A LEFT JOIN EMPLOYEES B ON A.EMPLOYEE_ID=B.MANAGER_ID WHERE B.FIRST_NAME ='David' 2.SELECT A.FIRST_NAME FROM EMPLOYEES A ,EMPLOYEES B WHERE A.EMPLOYEE_ID=B.MANAGER_ID AND B.FIRST_NAME ='David' 1.比较碱性请说明原因2.3. 请说明原因请说明原因请说明原因, 请说明原因英语翻译请说明原因, 并请说明原因请说明原因选择题,请说明原因请说明原因,跪谢! 请说明原因谢谢请说明原因请说明原因请说明原因, 请说明原因, 请说明原因请说明各个选项原因,