Question

mysql> desc oldtable;
+---------------+--------------+------+-----+---------+----------------+
| Field         | Type         | Null | Key | Default | Extra          |
+---------------+--------------+------+-----+---------+----------------+
| uid           | int(11)      | NO   | PRI | NULL    | auto_increment |
| active        | char(1)      | NO   |     | NULL    |                |
+---------------+--------------+------+-----+---------+----------------+


mysql> desc newtable;
+------------+--------------+------+-----+---------+----------------+
| Field      | Type         | Null | Key | Default | Extra          |
+------------+--------------+------+-----+---------+----------------+
| uid        | int(11)      | NO   | PRI | NULL    | auto_increment |
| active     | tinyint(1)   | NO   |     | 0       |                |
+------------+--------------+------+-----+---------+----------------+

我想将数据（转储）从oldtable移植到newtable。一个问题是，早期的表格使用char（1）表示存储值'Y'或'N'。现在newtable将它作为int存储为1或0。

如何在移植数据之前修复此问题？我应该使用shell脚本进行此类修复吗？搬运？任何示例脚本或提示:)

Answer 1

INSERT INTO newtable 
SELECT uid,IF(active='Y',1,0) as active FROM oldtable

应该做的伎俩

Answer 2

INSERT INTO newtable (uid, active)
    SELECT uid, IF(active='Y', 1, 0) AS active
    FROM oldtable

此语法的文档：http://dev.mysql.com/doc/refman/5.0/en/ansi-diff-select-into-table.html

Answer 3

开玩笑版：

INSERT INTO newtable 
SELECT uid,FIELD(active,'Y') as active 
FROM oldtable

通过脚本更改字段和端口mysql表数据？

3 个答案: