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I'm aware that WordPress stores all the post content of a multisite in the same database table and I was just wondering how it internally differentiates post content from one blog to the other?

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up vote 3 down vote accepted

Posts from one site are not stored in the same table as posts from another site.

Each blog on a multi site gets an ID and that ID is used to generate a separate set of tables for each site in a multisite installation.

So for example site 1 gets:

wp_posts

where as site 2 gets:

wp_1_posts

and so on:

wp_2_posts
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