create or replace view tbtky_catalognode_applyform_v as
select u.f_formeid as vid,a.F_USERNAME,c.f_name,a.F_PHONE,a.F_EMAIL,a.F_FAX,a.F_ZIPCODE,a.F_ADDRESS,a.f_data,c.f_time,c.f_abstract,c.f_region,c.f_contactemail,c.f_contactwebsite
from Tbtky_Applyform u left join  Tbtky_User_Role_v a
on u.f_userid=a.f_userid
left join  Tbtky_Catalognode c
on c.f_id=u.f_dataid;

create or replace view tbtky_catalognode_applyform_v as
创建视图的语句，视图不是表，是一种查询方式，没有主键

select u.f_formeid as vid 
设置主键语句 



left join ... on
左表(A)的记录将会全部表示出来,而右表(B)只会显示符合搜索条件的记录