Question

我正在处理一个选择以下信息的视图。我遇到的问题是单行子查询返回多行。但是，我无法看清问题是什么。任何建议都会有所帮助

CREATE OR REPLACE VIEW eqx_dir_ind_rep_emp_v (person_id,
                                          supervisor_id,
                                          employee_name,
                                          supervisor_name
                                         )
 AS
    SELECT     paf.person_id, paf.supervisor_id,
              (SELECT full_name employee_name
                 FROM per_people_f
                    WHERE person_id = paf.person_id
                      AND SYSDATE BETWEEN effective_start_date AND effective_end_date)
                                                            employee_name,
              (SELECT full_name supervisor_name
                 FROM per_people_f
                    WHERE person_id = supervisor_id
                      AND SYSDATE BETWEEN effective_start_date AND effective_end_date)
                                                          supervisor_name
   FROM apps.per_all_assignments_f paf

Answer 1

尝试添加以下内部选择语句。

CREATE OR REPLACE VIEW eqx_dir_ind_rep_emp_v (person_id,
                                          supervisor_id,
                                          employee_name,
                                          supervisor_name
                                         )
 AS
    SELECT     paf.person_id, paf.supervisor_id,
              (SELECT full_name employee_name
                 FROM per_people_f
                    WHERE person_id = paf.person_id
                      AND SYSDATE BETWEEN effective_start_date AND effective_end_date
                      AND rownum = 1)
                                                            employee_name,
              (SELECT full_name supervisor_name
                 FROM per_people_f
                    WHERE person_id = supervisor_id
                      AND SYSDATE BETWEEN effective_start_date AND effective_end_date
                      AND rownum = 1)
                                                          supervisor_name
   FROM apps.per_all_assignments_f paf

创建视图时，单行子查询返回多行

1 个答案: