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PostgreSQL Array庘昄

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PostgreSQL䔇ARRAY_AGG庘昄滇䫘準誂毖彄婔婻昄䂇婺䔇膷噖唚寙拸䷺㔗

gitbook.net

襕庖蓼庘昄ARRAY_AGG蔄荏臘COMPANY 螄嘘套婋

www.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)
 gitbook.net

䯄婘啺螆湹扞婪臘襕嘪䫘䔇ARRAY_AGG锔誺嘪䫘婋麵䔇变傴埇傖認湙啔

www.gitbook.net

testdb=# SELECT ARRAY_AGG(SALARY) FROM COMPANY; gitbook.net

傖婪PostgreSQL䔇臘嚔库䫘傖婋䂷悩 www.gitbook.net 

                  array_agg
---------------------------------------------
 {20000,15000,20000,65000,85000,45000,10000} 
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橸桺湺鵻PostgreSQL Array庘昄
蘸蘘臙媺䘍寘桺鷆毖:http://www.gitbook.net/html/postgresql/2013/080891.html
婪婔䇺PostgreSQL sum()庘昄      婋婔䇺PostgreSQL昄庖庘昄