Question

您好我的情况是用户被分配到多对多关系的项目。每次我添加新用户我希望为他复制现有的任务，在其他情况下将他分配给所有项目的话，也分配了其他用户。目前我复制整个表，然后重新插入如下，但想知道如果可以在一个查询中排序？

# tmp_assignments already exist and have same fields as assignment
truncate tmp_assignments;
INSERT tmp_assignments SELECT * FROM assignments;
# 38 is new user id
insert into assignments (project,user)
  select a.project,38
  from tmp_assignments as a group by project;

Answer 1

刚刚做的问题是什么：

insert into assignments (project, user) select project, 38 from assignments group by project

MYSQL：一个查询，用于复制多项关系中新项目的分配

1 个答案: