缺少INNER和LEFT JOIN之间的记录

Question

select id from table = 260 595 记录

select id from table left join table2 on table2.id = table.parent = 260 595 记录

select id from table inner join table2 on table2.id = table.parent = 260 192 记录

找出table中哪些记录有错误（不存在）的最简单方法是什么，以便我可以纠正它们？

感谢。

Answer 1

使用它（它会在表格中给出你在table2中没有相应记录的id）：

select id 
  from table left join table2 
    on table2.id = table.parent
 where table.parent is null

Answer 2

select id from table left join table2 on table2.id = table.parent
EXCEPT
select id from table inner join table2 on table2.id = table.parent

Answer 3

select id from table inner join table2 on table2.id <> table.parent