blocks|key|1543726|text|诀窍是将一个数据库中的it增加1000+(否则目标数据库中的数据不会重叠)，然后导入它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1543727|谢谢大家的回答。|1543728|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

The trick was to increment the IDs in one database by 1000 (or something won't overlap data in the target database), then import it.

Thanks for everyone's answers.

blocks|key|2740090|text|只需忽略重复的。第一次插入键时，它将被插入。第二次它将被忽略。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2740091|INSERT+IGNORE+INTO+myTable+(SELECT+*+FROM+myOtherTable+);|code-block|syntax|javascript|2740092|请参阅完整的插入语法这里。|2740093|entityMap|0|LINK|mutability|MUTABLE|url|http://dev.mysql.com/doc/refman/5.5/en/insert.html^0|0|7|0|0|A|2|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Just ignore the duplicates. The first time the key is inserted, it'll be inserted. The second time it will be ignored.

<pre><code>INSERT IGNORE INTO myTable (SELECT * FROM myOtherTable );
</code></pre>

See the full INSERT syntax <a href="http://dev.mysql.com/doc/refman/5.5/en/insert.html" rel="nofollow">here</a>.

blocks|key|1543630|text|重复的ID应该是相互对应的吗？您可以创建一个带有自动增量字段的新表，并将现有的键保存为两列。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1543631|不过，那只是一个“批量复制”。如果存在某种潜在的关系，那么这将决定如何组合数据。|1543632|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Are the duplicate IDs supposed to correspond to each other? You could create a new table with an auto increment field and save the existing keys as two columns.

That would just be a 'bulk copy' though. If there is some underlying relationship then that would dictate how to combine the data.

blocks|key|1543672|text|如果您有两个表A1和A2，并且希望将其合并为AA，则可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1543673|INSERT+INTO+aa+SELECT+*+FROM+A1;
INSERT+INTO+aa+SELECT+*+FROM+A2+ON+DUPLICATE+KEY+
++UPDATE+aa.nonkeyfield1+=+a1.nonkeyfield1,
+++++++++aa.nonkeyfield2+=+a1.nonkeyfield2,+....;|code-block|syntax|javascript|1543674|这将用A2数据覆盖具有重复键的字段。|1543675|使用更简单语法的稍微慢一些的方法是：|1543676|INSERT+INTO+aa+SELECT+*+FROM+A1;
REPLACE+INTO+aa+SELECT+*+FROM+A2;|1543677|这将做同样的事情，但不会更新重复的行，而是首先从A1中删除该行，然后从A2重新插入数据。|1543678|如果要将整个数据库与外键合并，这将无法工作，因为它会破坏表之间的链接。|1543679|如果您有一个完整的数据库，并且执行而不是，则希望覆盖数据|offset|length|style|BOLD|1543680|我会像往常一样将第一个数据库导入数据库A。|1543681|将第二个数据库导入数据库B。|1543682|将所有外键设置为on+update+cascade。再来看看这个。|CODE|1543683|现在，在数据库B上的所有表上运行以下语句。|1543684|+SELECT+@increment:=+MAX(pk)+FROM+A.table1;
+UPDATE+B.table1+SET+pk+=+pk+%2B+@increment+WHERE+pk+IS+NOT+NULL+
+++ORDER+BY+pk+DESC;|1543685|(+where子句是为了阻止MySQL在严格模式下提供错误)|1543686|如果您在数据库中用这两行编写了一个脚本，那么可以将所有表插入到数据库AA中，请记住在更新期间禁用外键检查。|1543687|SET+foreign_key_checks+=+0;
...+do+lots+of+inserts+...
SET+foreign_key_checks+=+1;|1543688|祝好运。|1543689|entityMap^0|0|0|0|0|0|0|0|0|S|0|0|0|8|H|0|0|0|2|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1I|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1J|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|1K|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|1L|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|1M|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1N|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1O|8|@$S|1P|T|1Q|U|V]]|9|@]|A|$]]|$1|W|3|X|5|6|7|1R|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1S|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|1T|8|@$S|1U|T|1V|U|12]]|9|@]|A|$]]|$1|13|3|14|5|6|7|1W|8|@]|9|@]|A|$]]|$1|15|3|16|5|D|7|1X|8|@]|9|@]|A|$E|F]]|$1|17|3|18|5|6|7|1Y|8|@$S|1Z|T|20|U|12]]|9|@]|A|$]]|$1|19|3|1A|5|6|7|21|8|@]|9|@]|A|$]]|$1|1B|3|1C|5|D|7|22|8|@]|9|@]|A|$E|F]]|$1|1D|3|1E|5|6|7|23|8|@]|9|@]|A|$]]|$1|1F|3|-4|5|6|7|24|8|@]|9|@]|A|$]]]|1G|$]]

If you have two tables A1 and A2 and you want to merge this to AA you can do this:

<pre><code>INSERT INTO aa SELECT * FROM A1;
INSERT INTO aa SELECT * FROM A2 ON DUPLICATE KEY 
 UPDATE aa.nonkeyfield1 = a1.nonkeyfield1,
 aa.nonkeyfield2 = a1.nonkeyfield2, ....;
</code></pre>

This will overwrite fields with duplicate keys with A2 data.

A slightly slower method with simpler syntax is:

<pre><code>INSERT INTO aa SELECT * FROM A1;
REPLACE INTO aa SELECT * FROM A2;
</code></pre>

This will do the same thing, but will not update duplicate rows, but instead delete the row from A1 first and then reinsert the data from A2.

If you want to merge a whole database with foreign keys, this will not work, because it will break the links between tables.

If you have a whole database and you do not want to overwrite data 
I'd import the first database as normal into database A. 
import the second database into a database B. 
Set all foreign keys as <code>on update cascade</code>.
Double check this.

Now run the following statement on all tables on database B.

<pre><code> SELECT @increment:= MAX(pk) FROM A.table1;
 UPDATE B.table1 SET pk = pk + @increment WHERE pk IS NOT NULL 
 ORDER BY pk DESC;
</code></pre>

(The <code>where</code> clause is to stop MySQL from giving an error in strict mode)

If you write a script with those two lines per table in your database you can then insert all tables into database AA, remember to disable foreign key checks during the update with

<pre><code>SET foreign_key_checks = 0;
... do lots of inserts ...
SET foreign_key_checks = 1;
</code></pre>

Good luck.

blocks|key|3098774|text|创建一个新的数据库表，其中第一列为自动描述的主键。然后从数据库中添加列名并导入每个列名。然后，只需删除旧的主字段，并将新字段重命名以与您的主名称匹配。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3098775|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Create a new database table with an autoincrimented primary key as the first column. Then add the column names from your databases and import each one. Then just drop the old primary field, and rename the new one to match your primary name.

I have two MySQL databases with identical table structure, each populated with several thousand records. I need to merge the two into a single database but I can't import one into the other because of duplicate IDs. It's a relational database with many linked tables (fields point to other table record IDs).

Edit: The goal is to have data from both databases in one final database, without overwriting data, and updating foreign keys to match with new record IDs.

I'm not sure how to go about merging the two databases. I could write a script I suppose, but there's many tables and it would take a while to do. I wondered if anyone else had encountered this problem, and the best way to go about it?

Importing MySQL records with duplicate keys

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有两个具有相同表结构的MySQL数据库，每个数据库都填充了数千条记录。我需要将两者合并到一个数据库中，但由于ID重复，无法将其中一个导入另一个数据库。它是一个有许多链接表的关系数据库(字段指向其他表记录ID)。编辑：目标是将来自两个数据库的数据放在一个最终数据库中，而不覆盖数据，并更新外键以匹配新的记录ID。我不知道如何合并这两个数据库。我想我可以写一个脚本，但是有很多表，需要一段时间才能完成。

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