[英]Mysql: Updating column based on another columns value
I have about 300 records in my database that have invalid data in a column.我的数据库中有大约 300 条记录,其中列中有无效数据。 The columns that are invalid reference a user_id instead of a id code (shown in table).无效的列引用 user_id 而不是 id 代码(如表所示)。
I'm trying to set the new_foreign_dealer_id
= to the user_id inside the old_dealer_id_to_dealer
column我正在尝试将new_foreign_dealer_id
= 设置为old_dealer_id_to_dealer
列中的 user_id
So in the table, the user_id with the value 206 would search for 204 and replace 206's row column with 204's new_foreign_dealer_id
因此在表中,值为 206 的 user_id 将搜索 204 并将 206 的行列替换为 204 的new_foreign_dealer_id
Users Table before:之前的用户表:
+---------+-----------------------+-------------------------+
| user_id | new_foreign_dealer_id | old_dealer_id_to_delete |
+---------+-----------------------+-------------------------+
| 200 | 5 | 02-000012 |
| 204 | 8 | 02-000097 |
| 206 | 0 (invalid) | 204 (referneces user_id |
+---------+-----------------------+-------------------------+
Users Table after:之后的用户表:
+---------+-----------------------+-------------------------+
| user_id | new_foreign_dealer_id | old_dealer_id_to_delete |
+---------+-----------------------+-------------------------+
| 200 | 5 | 02-000012 |
| 204 | 8 | 02-000097 |
| 206 | 8 | 204 (referneces user_id |
+---------+-----------------------+-------------------------+
This is the query I tried这是我试过的查询
UPDATE users SET dealer_id_foreign = dealer_id_foreign WHERE dealer_id = user_id
NOTE: The column names in my query are correct.注意:我查询中的列名是正确的。 The ASCII columns are for clarity purposes. ASCII 列是为了清楚起见。
edit: ended up using PHP to achieve this.编辑:最终使用 PHP 来实现这一点。 still interested in a sql answer仍然对 sql 答案感兴趣
http://sqlfiddle.com/#!9/6e5a88/1 http://sqlfiddle.com/#!9/6e5a88/1
UPDATE my_table t
JOIN my_table new
ON t.old_dealer_id_to_delete = new.user_id
AND t.new_foreign_dealer_id = 0
SET t.new_foreign_dealer_id = new.new_foreign_dealer_id;
Try this I haven't tested it,so please test it first试试这个我还没有测试过,所以请先测试一下
UPDATE users u
JOIN users ucopy ON u.user_id = ucopy.user_id
SET dealer_id_foreign = dealer_id_foreign
WHERE dealer_id = user_id
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.