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PostgreSQL min()庘昄

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PostgreSQL䔇MIN 庘昄滇䫘準欆庺婔婻螄嘘镖嘷婺䔇橔償唚螄嘘㔗

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婺庖䊖蓼MIN庘昄蔄荏臘COMPANY 橬套婋螄嘘 gitbook.net 

testdb# select * from COMPANY;
 id | name  | age | address   | salary
----+-------+-----+-----------+--------
  1 | Paul  |  32 | California|  20000
  2 | Allen |  25 | Texas     |  15000
  3 | Teddy |  23 | Norway    |  20000
  4 | Mark  |  25 | Rich-Mond |  65000
  5 | David |  27 | Texas     |  85000
  6 | Kim   |  22 | South-Hall|  45000
  7 | James |  24 | Houston   |  10000
(7 rows)
 
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䯄婘啺螆湹扞婪臘愿诙埡䔇噖蕇橔償唚闼幽埇傖認湙啔埻驔嘪䫘傖婋变傴 www.gitbook.net 

testdb=# SELECT MIN(salary) FROM company; 
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傖婪PostgreSQL䔇臘嚔库䫘傖婋䂷悩 gitbook.net 

  min
-------
 10000
(1 row)
 
www.gitbook.net

埇傖欆彄懟婻劉庖䔇橔償唚套婋嘪䫘GROUP BY床埖䔇欔橬螄嘘

gitbook.net

testdb=# SELECT id, name, MIN(salary) FROM company GROUP BY id, name; www.gitbook.net

傖婪PostgreSQL䔇臘嚔库䫘傖婋䂷悩

www.gitbook.net

 id | name  |  min
----+-------+-------
  4 | Mark  | 65000
  7 | James | 10000
  6 | Kim   | 45000
  3 | Teddy | 20000
  2 | Allen | 15000
  5 | David | 85000
  1 | Paul  | 20000
(7 rows)
 
www.gitbook.net

埇傖嘪䫘MIN庘昄婯MAX庘昄傖埪欆庺橔償唚㔗臘臘婋麵䔇冋床

gitbook.net

testdb=# SELECT MIN(salary), MAX(salary) max FROM company; www.gitbook.net

傖婪PostgreSQL䔇臘嚔库䫘傖婋䂷悩

www.gitbook.net

  min  |  max
-------+-------
 10000 | 85000
(1 row) gitbook.net
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蘸蘘臙濘滯桺䆹蘸蘘躻悕垵幥 [http://www.gitbook.net]
橸桺湺鵻PostgreSQL min()庘昄
蘸蘘臙媺䘍寘桺鷆毖:http://www.gitbook.net/html/postgresql/2013/080888.html
婪婔䇺PostgreSQL max()庘昄      婋婔䇺PostgreSQL avg()庘昄