EN
PostgreSQL - extract week from date/time value (ISO-8601)
0 points
In this article, we would like to show you how to extract week (ISO-8601) from DATE, TIMESTAMP TIME or INTERVAL in PostgreSQL.
Quick solution:
xxxxxxxxxx1
SELECT EXTRACT('week' FROM "column_name")2
FROM "table_name";
Note:
At the end of this article you can find database preparation SQL queries.
In this example, we will only select weeks from each record in the event_datetime column.
Query:
xxxxxxxxxx1
SELECT EXTRACT('week' FROM "event_datetime") AS "week"2
FROM "events";Output:
create_tables.sql file:
xxxxxxxxxx1
CREATE TABLE "events" (2
"id" SERIAL PRIMARY KEY,3
"event_timestamp" TIMESTAMP NOT NULL4
);insert_data.sql file:
xxxxxxxxxx1
INSERT INTO "events" 2
("event_timestamp")3
VALUES4
('2021-03-11 11:41:31'),5
('2021-03-21 12:42:32'),6
('2021-03-22 14:44:34'),7
('2021-03-22 15:45:35'),8
('2021-03-23 16:46:36'),9
('2021-04-05 17:47:37'),10
('2021-04-05 19:49:39'),11
('2021-04-16 20:50:40'),12
('2021-04-17 15:45:35'),13
('2021-04-23 16:46:36'),14
('2021-04-23 19:49:39'),15
('2021-04-23 20:50:40');