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Day of week postgresql

Datepart postgres

SELECT date_part('day', TIMESTAMP '2001-02-16 20:38:40');
Result: 16

SELECT date_part('hour', INTERVAL '4 hours 3 minutes');
Result: 4

4

Day of week postgresql

select extract(dow from date '2016-12-18'); /* sunday */

1

Source: stackoverflow.com

Postgres week number

select to_char(current_date, 'IYYY-IW');

0

Source: stackoverflow.com

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