如何将一列中的多个列移动到新的一对多表中？

Question

我想通过将一个表分成两个来重构我的数据库。我想将一些现有的列移动到一个新表中。例如，假设我想将表中的home_address和work_address字段移动到新的Address表中。

如何使用sqlite来完成这个？

前：

Employee Table 
    employee_id (Primary) 
    name 
    home_address 
    home_city 
    work_address 
    work_city 

后：

Employee Table 
    employee_id (Primary) 
    name 
    home_address_id 
    work_address_id 

Address Table 
    address_id (Primary) 
    address 
    city 

Answer 1

我宁愿迁移是简单明了，无需额外的逻辑，等等。至少当你运行它们只有一次或所以。

因此，首先检查什么是max（employee_id），下面假设它小于10000（它是整数）。

create table employee_new(employee_id,name,home_address_id,work_address_id); 
insert into employee_new select employee_id,name,employee_id,employee_id+10000 from employee; 
create table address(address_id,address,city); 
insert into address select employee_id,home_address,home_city from employee; 
insert into address select employee_id+10000,work_address,work_city from employee; 
alter table employee rename to employee_old; 
alter table employee_new rename to employee;