在单个表格上计算增量

Question

如何计算位于同一个表格中的两组数据之间的添加，删除和修改？这里有一个例子：

drop table if exists people; 
create table people (job int, id int, name varchar(255)); 

insert into people values (1, 1, "Amy"); 
insert into people values (1, 2, "Bob"); 
insert into people values (1, 3, "Chris"); 

insert into people values (2, 1, "Amy"); 
insert into people values (2, 2, "Robert"); 
insert into people values (2, 4, "Dennis"); 

在这个例子中，Bob的名字变成了罗伯特，克里斯已被删除，丹尼斯已添加。

到目前为止，我可以得到补充：

select p2.* from people p1 
right join people p2 
on p1.job = 1 
and p2.job = 2 
and p1.id = p2.id 
where p2.job = 2 
and p1.id is null; 

，我可以得到的缺失：

select p1.* from people p1 
left join people p2 
on p1.job = 1 
and p2.job = 2 
and p1.id = p2.id 
where p1.job = 1 
and p2.id is null; 

但我不知道怎么去修改。

有没有更好的方法？

谢谢

Answer 1

我设法搞清楚了！

select * from people p1 
join people p2 
on p1.job = 1 
and p2.job = 2 
and p1.id = p2.id 
where p1.name != p2.name; 

最后并没有那么糟糕。

Answer 2

对于您的示例数据，这将返回改性：

select * from people p1 
join people p2 
on p1.job = 1 
and p2.job = 2 
and p1.id = p2.id   -- same id 
WHERE p1.name <> p2.name -- but different name