Question

我正在查询结果，我想将customer_id复制到新表格字段old_customer_id，customer_id将替换最新记录。

+-------------+-----------------+
| customer_id | old_customer_id |
|-------------+-----------------+
|      5      |                 |
|      3      |                 |
|      1      |                 |
+-------------+-----------------+

在我的查询获得上述结果后，我想将customer_id复制到old_customer_id它将

+-------------+-----------------+
| customer_id | old_customer_id |
|-------------+-----------------+
|      5      |        5        |
|      5      |        3        |
|      5      |        1        |
+-------------+-----------------+

Answer 1

UPDATE YourTable
SET old_customer_id = customer_id, customer_id = 5

DEMO

Answer 2

您可以尝试两个单独的UPDATE个查询。首先更新old_c_id字段，然后更新c_id。

类似的东西：

UPDATE customerTable
SET old_c_id = c_id;

然后，在另一个c_id查询中设置UPDATE。

不确定如果您在同一个查询中尝试过这两种情况会发生什么，可能有效：

UPDATE cTable
SET old_c_id = c_id, c_id = ??;

Answer 3

UPDATE table_name SET old_customer_id = customer_id，customer_id = @your_new_customer_id;

MySQL将查询记录复制到新表字段并更新当前记录

3 个答案: