LEFT JOIN t_user ON CONCAT(t_user.company_code, t_user.employee_number) = order_management.order_manager_employee_code LEFT JOIN t_sbu sbu ON sbu.sbu_code = aggregation.sbu_code LEFT JOIN tb_0030032_dt_lm_department order_department ON order_department.tms_organization_code = order_management.office_group_code LEFT JOIN tb_0030032_dt_lm_department project_department ON project_department.tms_organization_code = project.project_office_group_code LEFT JOIN ( SELECT DISTINCT 1 AS request_flag, order_plan_id FROM t_hr_request_overview ) request_overview ON order_management.order_plan_id = request_overview.order_plan_id LEFT JOIN ( SELECT DISTINCT 1 AS employee_flag, contract_l1.entruster_order_plan_id AS order_plan_id FROM tb_0080332_dt_pc_inhouse_contract_order_plan contract_l1 LEFT JOIN tb_0080332_dt_pc_inhouse_contract_order_plan contract_l2 ON contract_l1.trustee_order_plan_id = contract_l2.entruster_order_plan_id LEFT JOIN t_order_plan_employee_detail detail ON contract_l1.trustee_order_plan_id = detail.order_plan_id OR contract_l2.trustee_order_plan_id = detail.order_plan_id UNION SELECT DISTINCT 1 AS employee_flag, order_plan_id FROM t_order_plan_employee_detail ) employee_detail ON order_management.order_plan_id = employee_detail.order_plan_id 翻译代码

以下是对代码的翻译：

LEFT JOIN t_user							
ON CONCAT(t_user.company_code, t_user.employee_number) =							
    order_management.order_manager_employee_code							
LEFT JOIN t_sbu sbu							
ON sbu.sbu_code = aggregation.sbu_code							
LEFT JOIN tb_0030032_dt_lm_department order_department							
ON order_department.tms_organization_code =							
    order_management.office_group_code							
LEFT JOIN tb_0030032_dt_lm_department project_department							
ON project_department.tms_organization_code =							
    project.project_office_group_code							
LEFT JOIN (							
    SELECT DISTINCT 1 AS request_flag,							
        order_plan_id							
    FROM t_hr_request_overview							
) request_overview							
ON order_management.order_plan_id = request_overview.order_plan_id							
LEFT JOIN (							
    SELECT DISTINCT 1 AS employee_flag,							
        contract_l1.entruster_order_plan_id AS order_plan_id							
    FROM tb_0080332_dt_pc_inhouse_contract_order_plan contract_l1							
    LEFT JOIN tb_0080332_dt_pc_inhouse_contract_order_plan contract_l2							
    ON contract_l1.trustee_order_plan_id							
        = contract_l2.entruster_order_plan_id							
    LEFT JOIN t_order_plan_employee_detail detail							
    ON contract_l1.trustee_order_plan_id = detail.order_plan_id							
    OR contract_l2.trustee_order_plan_id = detail.order_plan_id							
    UNION							
    SELECT DISTINCT 1 AS employee_flag,							
        order_plan_id							
    FROM t_order_plan_employee_detail							
) employee_detail							
ON order_management.order_plan_id = employee_detail.order_plan_id

上述代码的翻译如下：

- 第1个 `LEFT JOIN` 子句连接了 `t_user` 表，将其别名为 `t_user`。连接条件是将 `t_user` 表的 `company_code` 和 `employee_number` 字段拼接后与 `order_management` 表的 `order_manager_employee_code` 字段进行比较。
- 第2个 `LEFT JOIN` 子句连接了 `t_sbu` 表，将其别名为 `sbu`。连接条件是将 `sbu` 表的 `sbu_code` 字段与 `aggregation` 表的 `sbu_code` 字段进行比较。
- 第3个 `LEFT JOIN` 子句连接了 `tb_0030032_dt_lm_department` 表，将其别名为 `order_department`。连接条件是将 `order_department` 表的 `tms_organization_code` 字段与 `order_management` 表的 `office_group_code` 字段进行比较。
- 第4个 `LEFT JOIN` 子句连接了 `tb_0030032_dt_lm_department` 表，将其别名为 `project_department`。连接条件是将 `project_department` 表的 `tms_organization_code` 字段与 `project` 表的 `project_office_group_code` 字段进行比较。
- 第5个 `LEFT JOIN` 子句连接了一个子查询，将其别名为 `request_overview`。子查询返回了一个带有唯一标识列 `request_flag` 和 `order_plan_id` 的结果集。连接条件是将 `order_management` 表的 `order_plan_id` 字段与子查询的 `order_plan_id` 字段进行比较。
- 第6个 `LEFT JOIN` 子句连接了另一个子查询，将其别名为 `employee_detail`。第二个子查询使用了 `UNION` 将两个查询结果合并，并返回一个带有唯一标识列 `employee_flag` 和 `order_plan_id` 的结果集。连接条件是将 `order_management` 表的 `order_plan_id` 字段与子查询的 `order_plan_id` 字段进行比较。

这段代码的目的是进行多个表的连接操作，并根据指定的连接条件筛选出符合要求的记录。最终，返回包含指定字段的结果集。