PostgreSQL/Date Timezone/Date Time Format
Версия от 13:45, 26 мая 2010; (обсуждение)
Содержание
to_char(now(), "Dy (Day), Mon (Month)")
postgres=# SELECT to_char(now(), "Dy (Day), Mon (Month)") AS abbreviations,
postgres-# to_char("yesterday"::timestamp, "FMMonth FMDDth") AS yesterday,
postgres-# to_char("yesterday"::timestamp, "FMDDth FMMonth") AS "yesterday UK";
abbreviations | yesterday | yesterday UK
----------------------------------+-------------+--------------
Sun (Sunday ), Oct (October ) | October 7th | 7th October
(1 row)
postgres=#
postgres=#
to_char(now(), "HH:MI PM")
postgres=# SELECT to_char(now(), "HH:MI PM") AS the_time;
the_time
----------
03:20 PM
(1 row)
postgres=#
to_char(start_date, "FMMonth FMDDth, YYYY")
postgres=#
postgres=# CREATE TABLE employee (
postgres(# ID int,
postgres(# name varchar(10),
postgres(# salary real,
postgres(# start_date date,
postgres(# city varchar(10),
postgres(# region char(1)
postgres(# );
CREATE TABLE
postgres=#
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (1, "Jason", 40420, "02/01/94", "New York", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (2, "Robert",14420, "01/02/95", "Vancouver","N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (3, "Celia", 24020, "12/03/96", "Toronto", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (4, "Linda", 40620, "11/04/97", "New York", "N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (5, "David", 80026, "10/05/98", "Vancouver","W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (6, "James", 70060, "09/06/99", "Toronto", "N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (7, "Alison",90620, "08/07/00", "New York", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (8, "Chris", 26020, "07/08/01", "Vancouver","N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (9, "Mary", 60020, "06/09/02", "Toronto", "W");
INSERT 0 1
postgres=#
postgres=# select * from employee;
id | name | salary | start_date | city | region
----+--------+--------+------------+-----------+--------
1 | Jason | 40420 | 1994-02-01 | New York | W
2 | Robert | 14420 | 1995-01-02 | Vancouver | N
3 | Celia | 24020 | 1996-12-03 | Toronto | W
4 | Linda | 40620 | 1997-11-04 | New York | N
5 | David | 80026 | 1998-10-05 | Vancouver | W
6 | James | 70060 | 1999-09-06 | Toronto | N
7 | Alison | 90620 | 2000-08-07 | New York | W
8 | Chris | 26020 | 2001-07-08 | Vancouver | N
9 | Mary | 60020 | 2002-06-09 | Toronto | W
(9 rows)
postgres=#
postgres=# SELECT name, to_char(start_date, "FMMonth FMDDth, YYYY") AS informal,
postgres-# to_char(start_date, "YYYY-MM-DD") AS formal,
postgres-# to_char(start_date, "Y,YYY "years" A.D.") AS first_published
postgres-# FROM employee;
name | informal | formal | first_published
--------+---------------------+------------+------------------
Jason | February 1st, 1994 | 1994-02-01 | 1,994 years A.D.
Robert | January 2nd, 1995 | 1995-01-02 | 1,995 years A.D.
Celia | December 3rd, 1996 | 1996-12-03 | 1,996 years A.D.
Linda | November 4th, 1997 | 1997-11-04 | 1,997 years A.D.
David | October 5th, 1998 | 1998-10-05 | 1,998 years A.D.
James | September 6th, 1999 | 1999-09-06 | 1,999 years A.D.
Alison | August 7th, 2000 | 2000-08-07 | 2,000 years A.D.
Chris | July 8th, 2001 | 2001-07-08 | 2,001 years A.D.
Mary | June 9th, 2002 | 2002-06-09 | 2,002 years A.D.
(9 rows)
postgres=#
postgres=# drop table employee;
DROP TABLE
postgres=#
to_char(start_date, "YYYY-MM-DD")
postgres=#
postgres=# CREATE TABLE employee (
postgres(# ID int,
postgres(# name varchar(10),
postgres(# salary real,
postgres(# start_date date,
postgres(# city varchar(10),
postgres(# region char(1)
postgres(# );
CREATE TABLE
postgres=#
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (1, "Jason", 40420, "02/01/94", "New York", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (2, "Robert",14420, "01/02/95", "Vancouver","N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (3, "Celia", 24020, "12/03/96", "Toronto", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (4, "Linda", 40620, "11/04/97", "New York", "N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (5, "David", 80026, "10/05/98", "Vancouver","W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (6, "James", 70060, "09/06/99", "Toronto", "N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (7, "Alison",90620, "08/07/00", "New York", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (8, "Chris", 26020, "07/08/01", "Vancouver","N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (9, "Mary", 60020, "06/09/02", "Toronto", "W");
INSERT 0 1
postgres=#
postgres=# select * from employee;
id | name | salary | start_date | city | region
----+--------+--------+------------+-----------+--------
1 | Jason | 40420 | 1994-02-01 | New York | W
2 | Robert | 14420 | 1995-01-02 | Vancouver | N
3 | Celia | 24020 | 1996-12-03 | Toronto | W
4 | Linda | 40620 | 1997-11-04 | New York | N
5 | David | 80026 | 1998-10-05 | Vancouver | W
6 | James | 70060 | 1999-09-06 | Toronto | N
7 | Alison | 90620 | 2000-08-07 | New York | W
8 | Chris | 26020 | 2001-07-08 | Vancouver | N
9 | Mary | 60020 | 2002-06-09 | Toronto | W
(9 rows)
postgres=#
postgres=# SELECT name, to_char(start_date, "FMMonth FMDDth, YYYY") AS informal,
postgres-# to_char(start_date, "YYYY-MM-DD") AS formal,
postgres-# to_char(start_date, "Y,YYY "years" A.D.") AS first_published
postgres-# FROM employee;
name | informal | formal | first_published
--------+---------------------+------------+------------------
Jason | February 1st, 1994 | 1994-02-01 | 1,994 years A.D.
Robert | January 2nd, 1995 | 1995-01-02 | 1,995 years A.D.
Celia | December 3rd, 1996 | 1996-12-03 | 1,996 years A.D.
Linda | November 4th, 1997 | 1997-11-04 | 1,997 years A.D.
David | October 5th, 1998 | 1998-10-05 | 1,998 years A.D.
James | September 6th, 1999 | 1999-09-06 | 1,999 years A.D.
Alison | August 7th, 2000 | 2000-08-07 | 2,000 years A.D.
Chris | July 8th, 2001 | 2001-07-08 | 2,001 years A.D.
Mary | June 9th, 2002 | 2002-06-09 | 2,002 years A.D.
(9 rows)
postgres=#
postgres=# drop table employee;
DROP TABLE
postgres=#
to_char(start_date, "Y,YYY "years" A.D.")
postgres=#
postgres=# CREATE TABLE employee (
postgres(# ID int,
postgres(# name varchar(10),
postgres(# salary real,
postgres(# start_date date,
postgres(# city varchar(10),
postgres(# region char(1)
postgres(# );
CREATE TABLE
postgres=#
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (1, "Jason", 40420, "02/01/94", "New York", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (2, "Robert",14420, "01/02/95", "Vancouver","N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (3, "Celia", 24020, "12/03/96", "Toronto", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (4, "Linda", 40620, "11/04/97", "New York", "N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (5, "David", 80026, "10/05/98", "Vancouver","W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (6, "James", 70060, "09/06/99", "Toronto", "N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (7, "Alison",90620, "08/07/00", "New York", "W");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (8, "Chris", 26020, "07/08/01", "Vancouver","N");
INSERT 0 1
postgres=# insert into employee (ID, name, salary, start_date, city, region)
postgres-# values (9, "Mary", 60020, "06/09/02", "Toronto", "W");
INSERT 0 1
postgres=#
postgres=# select * from employee;
id | name | salary | start_date | city | region
----+--------+--------+------------+-----------+--------
1 | Jason | 40420 | 1994-02-01 | New York | W
2 | Robert | 14420 | 1995-01-02 | Vancouver | N
3 | Celia | 24020 | 1996-12-03 | Toronto | W
4 | Linda | 40620 | 1997-11-04 | New York | N
5 | David | 80026 | 1998-10-05 | Vancouver | W
6 | James | 70060 | 1999-09-06 | Toronto | N
7 | Alison | 90620 | 2000-08-07 | New York | W
8 | Chris | 26020 | 2001-07-08 | Vancouver | N
9 | Mary | 60020 | 2002-06-09 | Toronto | W
(9 rows)
postgres=#
postgres=# SELECT name, to_char(start_date, "FMMonth FMDDth, YYYY") AS informal,
postgres-# to_char(start_date, "YYYY-MM-DD") AS formal,
postgres-# to_char(start_date, "Y,YYY "years" A.D.") AS first_published
postgres-# FROM employee;
name | informal | formal | first_published
--------+---------------------+------------+------------------
Jason | February 1st, 1994 | 1994-02-01 | 1,994 years A.D.
Robert | January 2nd, 1995 | 1995-01-02 | 1,995 years A.D.
Celia | December 3rd, 1996 | 1996-12-03 | 1,996 years A.D.
Linda | November 4th, 1997 | 1997-11-04 | 1,997 years A.D.
David | October 5th, 1998 | 1998-10-05 | 1,998 years A.D.
James | September 6th, 1999 | 1999-09-06 | 1,999 years A.D.
Alison | August 7th, 2000 | 2000-08-07 | 2,000 years A.D.
Chris | July 8th, 2001 | 2001-07-08 | 2,001 years A.D.
Mary | June 9th, 2002 | 2002-06-09 | 2,002 years A.D.
(9 rows)
postgres=#
postgres=# drop table employee;
DROP TABLE
postgres=#
to_char("yesterday"::timestamp, "FMMonth FMDDth")
postgres=# SELECT to_char(now(), "Dy (Day), Mon (Month)") AS abbreviations,
postgres-# to_char("yesterday"::timestamp, "FMMonth FMDDth") AS yesterday,
postgres-# to_char("yesterday"::timestamp, "FMDDth FMMonth") AS "yesterday UK";
abbreviations | yesterday | yesterday UK
----------------------------------+-------------+--------------
Sun (Sunday ), Oct (October ) | October 7th | 7th October
(1 row)
postgres=#
postgres=#
to_date("198025thJune", "YYYYDDthMonth")
postgres=#
postgres=# SELECT to_date("198025thJune", "YYYYDDthMonth") AS correct_interpretation;
correct_interpretation
------------------------
1980-06-25
(1 row)
postgres=#