Deleting a custom field field

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Is there a way to delete a custom field (in the sense of complete removal from WP database) without using a plugin?

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  1. If you have access to phpMyAdmin, these steps should do the trick:

    Step 1: Login to your hosting account and launch myPHPadmin from the
    cPanel, or equivalent, to access the WordPress database engine.

    Step 2: Enter a select SQL command to list all the meta keys you want
    to remove. In this example, I want to find and eventually remove the
    meta key dcssb_short_url.

    SELECT * FROM 'wp_postmeta' where 'meta_key' = 'dcssb_short_url'

    Step 3: Once you are satisfied you’ve narrowed down the selection,
    issue a delete SQL command to remove the rogue data

    DELETE * FROM 'wp-postmeta' WHERE 'meta_key' = 'dcssb_short_url'

    Step 4: Issue the same select SQL command again, to verify all the
    offending records have been deleted.

    SELECT * FROM 'wp_postmeta' where 'meta_key' = 'dcssb_short_url'

    If you get no results returned, it means that you successfully deleted
    the records.

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