Comments on: How to write multi-table, cross-database deletes with aliases in MySQL http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/ Stay curious! Sun, 20 Jul 2008 22:41:56 +0000 http://wordpress.org/?v=2.2.2 By: Sprok http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-5771 Sprok Mon, 16 Apr 2007 06:41:53 +0000 http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-5771 <p>Thank you so much. You saved my neck :D</p> Thank you so much. You saved my neck :D

]]> By: Xaprb http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-5658 Xaprb Wed, 11 Apr 2007 18:21:12 +0000 http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-5658 <p>You can't do it. You may want to look into the FEDERATED storage engine. For more help, try the #mysql IRC channel.</p> You can’t do it. You may want to look into the FEDERATED storage engine. For more help, try the #mysql IRC channel.

]]> By: Anz http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-5636 Anz Wed, 11 Apr 2007 10:32:12 +0000 http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-5636 <p>Hi, Can you please tell me how can write CROSS-SERVER queries in mysql. I want to join tables from two different mysql servers for .net desktop application. Thanks Anz</p> Hi,
Can you please tell me how can write CROSS-SERVER queries in mysql. I want to join tables from two different mysql servers for .net desktop application.

Thanks
Anz

]]> By: Xaprb http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-3057 Xaprb Tue, 09 Jan 2007 19:52:50 +0000 http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-3057 <p>This technique is specifically about cross-database joins on MySQL, which has some very annoying quirks. It doesn't apply to selects. I've never seen syntax quite like yours -- you might not have valid SQL there. Also, you seem to be talking about cross-server deletes; this is only cross-database, not cross-server (a single server/instance may have many databases).</p> <p>You should probably seek help on #mysql or a mailing list. There are lots of friendly folks there who can help you more quickly than I'll be able to in these comments ;-)</p> This technique is specifically about cross-database joins on MySQL, which has some very annoying quirks. It doesn’t apply to selects. I’ve never seen syntax quite like yours — you might not have valid SQL there. Also, you seem to be talking about cross-server deletes; this is only cross-database, not cross-server (a single server/instance may have many databases).

You should probably seek help on #mysql or a mailing list. There are lots of friendly folks there who can help you more quickly than I’ll be able to in these comments ;-)

]]> By: BermG http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-3056 BermG Tue, 09 Jan 2007 19:15:46 +0000 http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-3056 <p>Will this work with db2 and MySQL tables? My query fails with the same error:</p> <pre>SELECT incident.guid, incident.update_date, task1.short_description FROM ( DB2_A.incident incident LEFT JOIN MySQL_B.task task1 ON incident.incident_id = task1.id ) WHERE incident.guid = x'FF0BFBDD917EEB7D55B545FBD889FEEB'</pre> <p>How should I change this query? I played with quite a few combinations but still can't get by this error. Thanks</p> Will this work with db2 and MySQL tables? My query fails with the same error:

SELECT incident.guid, incident.update_date, task1.short_description FROM (
DB2_A.incident incident  LEFT JOIN MySQL_B.task task1 ON incident.incident_id = task1.id
)  WHERE incident.guid = x'FF0BFBDD917EEB7D55B545FBD889FEEB'

How should I change this query? I played with quite a few combinations but still can’t get by this error.

Thanks

]]> By: Xaprb http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-1493 Xaprb Mon, 14 Aug 2006 19:32:18 +0000 http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-1493 <p>Right, you also need to fully qualify the tables with a database name too. I mentioned that in the first article, but left it out of this one.</p> <p>So your code should say,</p> <pre>delete somedb.tag_item as ti, somedb.list_item as li...</pre> Right, you also need to fully qualify the tables with a database name too. I mentioned that in the first article, but left it out of this one.

So your code should say,

delete somedb.tag_item as ti, somedb.list_item as li...
]]> By: Patrick http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-1492 Patrick Mon, 14 Aug 2006 18:59:55 +0000 http://www.xaprb.com/blog/2006/08/07/how-to-write-multi-table-cross-database-deletes-with-aliases-in-mysql/#comment-1492 <p>I tried your method, however it doesn't seem to work with multiple tables in the delete statement using jdbc / connection j</p> <pre>delete tag_item as ti, list_item as li from tag_item as ti, list_item as li where ti.li_id = li.id and li.datum_id = ? and li.user_id = ?;</pre> <p>I keep getting Unknown table 'li' in MULTI DELETE</p> <p>On mysql 5.0.2.2</p> I tried your method, however it doesn’t seem to work with multiple tables in the delete statement using jdbc / connection j

delete tag_item as ti, list_item as li
    from  tag_item as ti, list_item as li
where  ti.li_id = li.id and li.datum_id = ? and li.user_id = ?;

I keep getting Unknown table ‘li’ in MULTI DELETE

On mysql 5.0.2.2

]]>