如何在 MySQL 中使用自动增量字段复制行并插入到同一个表中?
在 MySQL 中，我试图将具有 autoincrement column ID=1 的行和 insert 数据复制到同一个表中作为新的column ID=2 的行.
In MySQL I am trying to copy a row with an autoincrement column ID=1 and insert the data into same table as a new row with column ID=2.
如何在单个查询中执行此操作?
How can I do this in a single query?
推荐答案
使用INSERT ... SELECT:
insert into your_table (c1, c2, ...)
select c1, c2, ...
from your_table
where id = 1
其中c1, c2, ... 是除id 之外的所有列.如果您想使用 2 的 id 显式插入，则将其包含在 INSERT 列列表和 SELECT 中:
where c1, c2, ... are all the columns except id. If you want to explicitly insert with an id of 2 then include that in your INSERT column list and your SELECT:
insert into your_table (id, c1, c2, ...)
select 2, c1, c2, ...
from your_table
where id = 1
当然，在第二种情况下，您必须注意可能重复的 id 为 2.
You'll have to take care of a possible duplicate id of 2 in the second case of course.
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