T274221 What percentage of new topics are added without a title

Fork of T274221 What percentage of new topics are added without a title by Matma Rex

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SQL

select
	sum(comment_text='') as no_comment,
    sum(comment_text!='') as has_comment,
    count(*) as total,
    sum(comment_text='')/count(*)*100 as percent_no_comment
from revision
join change_tag on ct_rev_id=rev_id
join change_tag_def on ctd_id=ct_tag_id
join comment on comment_id=rev_comment_id
where ctd_name='discussiontools-newtopic'

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