//查询sys_username以S.00655开头的用户SELECT SUBSTRING(sys_username,3),sys_password FROM `tbl_sa_syslogin` where sys_username like 'S.%'; //修改S.00655用户的密码等于S码update tbl_sa_syslogin set sys_password = SUBSTRING(sys_username,3) where sys_username like 'S.%'; *///建立一个中间导出表create table tbl_export_network(    id int,    sys_username VARCHAR(10),    sys_password VARCHAR(10),    network_name VARCHAR(50),    network_name_old varchar(50),    phone VARCHAR(20),    telephone VARCHAR(20),    network_type  VARCHAR(10));//将关联查询的结果添加到中间导出表insert into tbl_export_network SELECT u.id,u.sys_username,u.sys_password,nw.network_name,nw.network_name_old,nw.phone,nw.telephone,nw.network_type FROM `tbl_sa_syslogin` u ,tbl_nw_networkinfo nwwhere nw.f_syslogin_id =u.id and u.sys_username like 'S.%' order by network_type,f_pca_province_id,f_pca_city_id,f_pca_area_id//查询中间导出表select * from tbl_export_network;//最后利用Navicat工具导出数据为excel，完成~!