Q&A about the site for biology researchers, academics, and students
1. Initial Title - The first title a question is asked with.
2. Initial Body - The first raw body text a post is submitted with.
3. Initial Tags - The first tags a question is asked with.
4. Edit Title - A question's title has been changed.
5. Edit Body - A post's body has been changed, the raw text is stored here as markdown.
6. Edit Tags - A question's tags have been changed.
7. Rollback Title - A question's title has reverted to a previous version.
8. Rollback Body - A post's body has reverted to a previous version - the raw text is stored here.
9. Rollback Tags - A question's tags have reverted to a previous version.
10. Post Closed - A post was voted to be closed.
11. Post Reopened - A post was voted to be reopened.
12. Post Deleted - A post was voted to be removed.
13. Post Undeleted - A post was voted to be restored.
14. Post Locked - A post was locked by a moderator.
15. Post Unlocked - A post was unlocked by a moderator.
16. Community Owned - A post has become community owned.
17. Post Migrated - A post was migrated.
18. Question Merged - A question has had another, deleted question merged into itself.
19. Question Protected - A question was protected by a moderator
20. Question Unprotected - A question was unprotected by a moderator
21. Post Disassociated - An admin removes the OwnerUserId from a post
22. Question Unmerged - A previously merged question has had its answers and votes restored.
SELECT PostHistoryTypeId, COUNT(PostId)
GROUP BY PostHistoryTypeId
ORDER BY PostHistoryTypeId