How to Exclude Current or Partial Weeks in PostgreSQL?

In recent versions of PostgreSQL, the WEEK() function has been enhanced to allow you to exclude weeks that are part of a month. In previous releases, this functionality was only available in the Postgres 9.

postgresql datetrunc too slow

By GutoTroslaGutoTrosla on Feb 24, 2021 
CREATE INDEX ON test (date_trunc('day', updated_at));

/*If updated_at is a timestamp without time zone, that will work fine. 
For a timestamp with time zone, you'll have to specify a time zone, 
because otherwise the result will depend on the session time zone, 
which makes it unusable for an index:*/

CREATE INDEX ON test (date_trunc('day', updated_at AT TIME ZONE 'UTC'));

Source: stackoverflow.com

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x server and could not be used on its own without being combined with another function such as FIRST_DAY() or LAST_DAY().

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