wp_posts table will be for the “main” site — the one from which the network was installed.
wp_*_posts will be for other sites in the network — one set of tables per site.
Excerpts are only saved when a user enters something in the “Excerpt” field in the admin area. If nothing was entered, nothing gets saved and WordPress will dynamically generate an excerpt if you request one. It’s fairly normal to have some empty excerpts.
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