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CREATE TABLE comment ( comment_id serial PRIMARY KEY , body text ); INSERT INTO comment(body) VALUES ('foo') , ('bar [deleted]') , ('not really [deleted') , ('[deleted]') , ('baz [deleted]') ;
5 rows affected
 hidden batch(es)

SELECT round(count(body LIKE '%[deleted]%' OR NULL)::numeric / NULLIF(count(*), 0), 2) AS percent_deleted FROM comment;
 hidden batch(es)