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CREATE TABLE fast_survey (id serial, answer boolean); INSERT INTO fast_survey (answer) VALUES (true), (false), (true), (true), (true) , (true), (true), (true), (true), (true) , (true), (true), (true), (true), (true) , (true), (true), (true), (true), (true) , (true), (false), (false), (false), (false);
25 rows affected
SELECT round(count(*) FILTER (WHERE answer) * 100.0 / count(*), 2) AS pct_yes , round(count(*) FILTER (WHERE NOT answer) * 100.0 / count(*), 2) AS pct_no FROM fast_survey;
pct_yes
pct_no
80.00
20.00