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Is it possible to setup some kind of smart replication, so that these columns are automatically updated if they are changed in another database ..

Like : rows are automatiically added, some columns are automatically synced, but other columns are not

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Let's say you have a four-column table. You want (for example) to sync only two of them. Is this what you want? –  Khaled Nov 23 '10 at 7:47

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Do you want to perform an action on the same database server rather than a remote DB? If so, the device you want are triggers: http://dev.mysql.com/doc/refman/5.0/en/triggers.html

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