Question

我似乎无法将旧表插入新表中。非常奇怪

代码：

INSERT INTO 'newhawk_playewadwds' (`player_id`,'player') SELECT `player_id`,'player' FROM 'hawk_playewadwds';

错误：

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You
have an error in your SQL syntax; check the manual that corresponds to your MySQ
L server version for the right syntax to use near ''newhawk_playewadwds' (`playe
r_id`,'player') SELECT `player_id`,'player' FROM 'h' at line 1

额外信息：

两个表都存在并且具有稍微不同的列结构（一个具有varchar（50），而另一个没有）。这就是我在声明中包含直接列的原因。

Answer 1

引号是字符串的分隔符。使用反引号来转义列名和表名，而不是引号。

INSERT INTO `newhawk_playewadwds` (`player_id`,`player`) 
SELECT `player_id`,`player` 
FROM `hawk_playewadwds`;

但实际上你只需要逃避reserved words。

Answer 2

尝试将'字符替换为表名，将列player替换为

INSERT INTO `newhawk_playewadwds` (`player_id`,`player`) 
SELECT `player_id`,`player` 
FROM `hawk_playewadwds`;

Answer 3

在查询中使用反引号。您正在使用反引号和单引号。使用反引号或删除单引号：

-- This will work (Backticks only)
INSERT INTO `newhawk_playewadwds` (`player_id`,`player`) 
SELECT `player_id`,`player` 
FROM `hawk_playewadwds`;

-- This will also work (No backticks and no single quotes)
INSERT INTO newhawk_playewadwds (player_id,player) 
SELECT player_id,player 
FROM hawk_playewadwds;

另一件事，正如你提到的列结构不同，

如果newhawk_playewadwds有列＆gt; 50，而hawk_playewadwds已经＆lt; 50，这应该不是问题
如果hawk_playewadwds' has > 50 and newhawk_playewadwds`已经<50，请执行以下任一操作：
1. 将新表newhawk_playewadwds的大小增加到hawk_playewadwds
2. 在select as中使用Substring：
```
INSERT INTO `newhawk_playewadwds` (`player_id`,`player`) 
    SELECT `player_id`,SUBSTRING(`player` ,1,50)
    FROM `hawk_playewadwds`;
```

MySQL + JAVA - 无法将表插入另一个表

3 个答案: