重新排序/重置自动增量主键
我有一个带有自动递增主键的 MySQL 表.我删除了表格中间的一些行.例如，现在我在 ID 列中有这样的内容:12、13、14、19、20.我删除了 15、16、17 和 18 行.
I have a MySQL table with an auto increment primary key. I deleted some rows in the middle of the table. Now I have, for example, something like this in the ID column: 12, 13, 14, 19, 20. I deleted the 15, 16, 17 and 18 rows.
我想重新分配/重置/重新排序主键，以便保持连续性，即使 19 变为 15，使 20 变为 16，依此类推.
I want to reassign / reset / reorder the primary key so that I have continuity, i.e. make the 19 a 15, the 20 a 16, and so on.
我该怎么做?
推荐答案
您可以删除主键列并重新创建它.然后应按顺序重新分配所有 ID.
You could drop the primary key column and re-create it. All the ids should then be reassigned in order.
然而，在大多数情况下这可能是一个坏主意.如果您有其他表具有该表的外键，那么它肯定不起作用.
However this is probably a bad idea in most situations. If you have other tables that have foreign keys to this table then it will definitely not work.
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