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CREATE TABLE my_table ( my_date date ); INSERT INTO my_table VALUES ('2019-06-22'), ('2019-06-23'), ('2019-06-24');
CREATE TABLE
INSERT 0 3
SELECT my_date - date_part('dow', my_date)::int FROM my_table
?column?
2019-06-16
2019-06-23
2019-06-23
SELECT 3