Sql Query to Delete Orphaned Post Meta in Your WordPress Database!

In WordPress, after creating, editing and deleting your blog posts, your database will contain  thousands of rows of useless meta data. If you want to  delete orphaned post meta on your database then here is a simple SQL query.

Just run the following query on your WordPress database to delete orphaned post meta. Don’t forget to replace the table prefix wp_ if your database is using another prefix.

And of course, create a backup of your database before running the query!

DELETE pm
FROM wp_postmeta pm
LEFT JOIN wp_posts wp ON wp.ID = pm.post_id
WHERE wp.ID IS NULL

Thanks to Patrick Rauland for submitting this useful recipe!

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