PostgreSQL/Date Timezone/Date Time Format — различия между версиями

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Текущая версия на 10:14, 26 мая 2010

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=#
Источник — «http://sqle.ru/index.php?title=PostgreSQL/Date_Timezone/Date_Time_Format&oldid=4941»