我在Pldeveloper和SQL*PLUS里面只要用join关键字作连接查询查询就出错，为什么啊？
select s.student_id,d.department_id from tbl_student s cross join tbl_department dselect s.student_name,d.depaetment_name from tbl_student s join tbl_department d on (d.department_id = s.department_id)select s.student_name,d.depaetment_name from tbl_student s left outer join tbl_department d on (d.department_id = s.department_id)
哪位大侠知道这是为什么啊？
select s.student_id,d.department_id from tbl_student s cross join tbl_department dselect s.student_name,d.depaetment_name from tbl_student s join tbl_department d on (d.department_id = s.department_id)select s.student_name,d.depaetment_name from tbl_student s left outer join tbl_department d on (d.department_id = s.department_id)
哪位大侠知道这是为什么啊？
解决方案 »
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