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Editorial Team
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Asked: 2026-05-23T12:21:21+00:00

I’m being asked if I can fetch the result from 18 different WordPress databases

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I’m being asked if I can fetch the result from 18 different WordPress databases merged into one database with conflicting names, filter them, and then play with the results in PHP.

For example:

I have data (posts) in ara_posts, val_posts, and car_posts (all of them are tables that have post_name, post_type, post_status and post_date in their column names). I want to select all the data from those tables and filter the result (only show results that have post_type = ‘post’).

What I want to do with the result is compare the dates and fetch the latest 3 posts from all those 18 tables, that have their status to “publish” and the post type “post”.

How is that possible?

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1 Answer

  1. Editorial Team

    As proposed in an answer to this question quite similar to yours, you can probably use the UNION operator. Something like this:

    (SELECT post_name, post_type, post_status, post_date FROM ara_posts WHERE post_status='publish' AND post_type='post')
UNION ALL
(SELECT post_name, post_type, post_status, post_date FROM val_posts WHERE post_status='publish' AND post_type='post')
UNION ALL
(...)
ORDER BY post_date DESC
LIMIT 3
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