今天早上我不知所措。也许我的咖啡被麻醉了?简单的问题 - 将现有的ID导入此临时表中进行导出。不更改行由此mySQL更新查询生成。为什么?
表所示:
表人
+--------+-----------------------+
| id | email |
+--------+-----------------------+
| 142755 | [email protected] |
+--------+-----------------------+
表no_dma
+--------+------------------------+
| person | email |
+--------+------------------------+
| 0 | [email protected] |
+--------+------------------------+
查询:
UPDATE
person, no_dma
SET no_dma.person = person.id
WHERE person.email = no_dma.email;
我已经验证了至少一些匹配鄂麦的存在l地址在两个表中,但更新产生
Query OK, 0 rows affected (9.31 sec)
Rows matched: 0 Changed: 0 Warnings: 0
很明显,我今天有点d bra。
请帮我吗?我做错了什么?
//编辑
每评论下面我做这些查询:
mysql> select person, email from no_dma limit 0,1;
+--------+------------------------+
| person | email |
+--------+------------------------+
| 0 | [email protected]
+--------+------------------------+
1 row in set (0.00 sec)
mysql> select email from no_dma where email = '[email protected]';
Empty set (0.00 sec)
mysql> select email from no_dma where TRIM(email) = '[email protected]';
Empty set (0.46 sec)
两个表具有电子邮件字段存储与整理设置为latin1_swedish_ci VARCHAR。
而这个查询,WTH?
mysql> SELECT CONCAT('"',email,'"') from no_dma limit 0,3;
+-----------------------+
| CONCAT('"',email,'"') |
+-----------------------+
" |[email protected]
" |[email protected]
" |[email protected]
+-----------------------+
mysql> SELECT email from no_dma limit 0,3;
+--------------------+
| email |
+--------------------+
|[email protected]
|[email protected]
|[email protected]
+--------------------+
这是怎么回事?看起来像换行符,但我认为TRIM()处理这些?
mysql> SELECT TRIM(email) from no_dma limit 0,3;
+--------------------+
| TRIM(email) |
+--------------------+
|[email protected]
|[email protected]
|[email protected]
+--------------------+
3 rows in set (0.00 sec)
UPDATE:FOUND ISSUE 进口被在Windows完成生成的CSV的mysqlimport但给予精氨酸
--lines封端逐= '\ n'
重新导入数据工作正常。 对不起,浪费了时间。
您是如何验证的?当你运行`SELECT person.id FROM person,no_dma WHERE person.email = no_dma.email`时,你会得到行吗? – 2011-02-11 15:55:42
我想我在你的例子中看到了一个额外的空间,在no_dma.email结尾处,尝试从no_dma`选择CONCAT('“',email,''')来查看是否是这种情况。 – jswolf19 2011-02-11 15:56:15