Question

我有一个表格（post_order）结构如下：

   | post_id | term_id | post_type | taxonomy |
   |    1    |    6    |    post   | category |
   |    2    |    6    |    post   | category |
   |    3    |    6    |    post   | category |

我想将所有字段复制到同一个表中，但更改term_id（例如，更改为7），因此，表格最终会如下所示：

   | post_id | term_id | post_type | taxonomy |
   |    1    |    6    |    post   | category |
   |    2    |    6    |    post   | category |
   |    3    |    6    |    post   | category |
   |    1    |    7    |    post   | category |
   |    2    |    7    |    post   | category |
   |    3    |    7    |    post   | category |

我知道我可以这样做：

INSERT INTO post_order (post_id, term_id, post_type, taxonomy)
SELECT post_id, term_id, post_type, taxonomy
FROM post_order
WHERE term_id = 6

但这会产生完全重复，而不会更改term_id。

我怎样才能做到这一点？

Answer 1

在term_id声明中对INSERT到7进行硬编码：

INSERT INTO post_order (post_id, term_id, post_type, taxonomy)
SELECT post_id, 7, post_type, taxonomy
FROM post_order
WHERE term_id = 6

SQL查询将字段值复制到同一个表中

1 个答案: