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Single SQL statement to the combined relationship of two tables from different manufacturers

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I question whether using JPA, you can ask a single SQL statement to the combined relationship of two tables from different manufacturers, for instance MySQL and MS SQL or Oracle ?

 

Is there any way to do this using Java ?

Edited by Forest

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I would guess there is not a way to do that, but that's just a guess. Database connections are individual connections to individual servers, I don't think there's a way in any language to send a single SQL statement that will work across multiple database connections.

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