/SQL/Select current_timestamp - interval '3 days';

Select current_timestamp - interval '3 days';

Today minus 15 days postgresql

--yesterday
SELECT NOW() - INTERVAL '1 DAY';

--Unrelated to the question, but PostgreSQL also supports some shortcuts:
SELECT 'yesterday'::TIMESTAMP, 'tomorrow'::TIMESTAMP, 'allballs'::TIME;

Source: stackoverflow.com

Select current_timestamp - interval '3 days';

SELECT current_timestamp - interval "3 days";
-- 2020-06-24 08:25:31.759993 America/Los_Angeles

Source: prestosql.io

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