insert into zw_m_chat_group_user(id,group_id,user_id,flag,create_data_time,create_data_username) VALUES (#{item.id}, #{item.groupId}, #{item.userId}, 1, #{item.createDataTime}, #{item.createDataUsername}) delete from zw_m_chat_group_user WHERE group_id = #{groupId} select * from zw_m_chat_group_user where group_id = #{groupId} and flag =1 select user_id from zw_m_chat_group_user where group_id = #{groupId} and flag =1 select distinct group_id from zw_m_chat_group_user where user_id = #{userId} and flag = 1 select distinct g.group_id userGroupId, g.group_name userGroupName from zw_m_chat_group g inner join zw_m_chat_group_user gu on g.group_id = gu.group_id and gu.user_id = #{userId} and gu.flag = 1 where g.flag = 1 select user_id, group_id from zw_m_chat_group_user where group_id in (select group_id from zw_m_chat_group_user where user_id = #{userId}) and flag = 1 select user_id, group_id from zw_m_chat_group_user where flag = 1