表在所有国家都存在唯一的员工类型1 Employee Name,Employee type, Country Present
Jim Mith , Consulting,England
Jim Mith, Manfacturing, Scotland
Jim Mith, Consulting, Northern Ireland
Mavis Mith, Consulting, France
假设我有三个表格,一个用户表格,一个包含约500个不同项目的表格和相应的连接表格。我想这样做的是: select * from users u join items_users iu on iu.user_id = u.id
where iu.item_id in (1,2,3,4,5)
and u.city_id = 1 limit 10;
除,而不是IN条件下,我想找到有所有相应项目的