Are empty post slugs useful?

In my WordPress blog I am facing some issues because of old post slugs, So I searched and deleted old post slugs in MySQL but the database has many empty old post slugs, I don't know about them. So my real question is that "Can I delete empty old post slugs? Is there any harm if I delete them?"

Solutions

As mentioned in comment by Jan Dvorak, I tested and deleted all the empty wp_old_slugs and everything seems fine.

But sure I don't know why these slugs ere empty?

Tags: Mysql / Wordpress

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