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PostgreSQL锂膏誊䞖严

準溊寘录桺䆹    䫌 悕垵幥 敘桄䬽橸    敟蓽庺渇

蔄荏臘 COMPANY 橬傖婋螄嘘

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 | gitbook.net |  24 | Houston2   |  10000
(7 rows)
 gitbook.net

婋麵滇䞔剘䔇冋床滆䴺PostgreSQL䔇锂膏誊䞖严䔇䫘濘㔗幘醇崓庯潡京庯25幽婫噖蕇崓庯潡京庯65000.00庖欔橬䔇螄嘘婋麵䔇SELECT臺埖彖臘

www.gitbook.net

testdb=# SELECT * FROM COMPANY WHERE AGE >= 25 AND SALARY >= 6500; www.gitbook.net

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

 id | name  | age |                      address                  | salary
----+-------+-----+-----------------------------------------------+--------
  1 | Paul  |  32 | California                                    |  20000
  2 | Allen |  25 | Texas                                         |  15000
  4 | Mark  |  25 | Rich-Mond                                     |  65000
  5 | David |  27 | Texas                                         |  85000
(4 rows)
 
gitbook.net

幘醇崓庯潡京庯25潡衻愘崓庯潡京庯65000.00欔橬䔇螄嘘彖臘婋麵䔇SELECT臺埖 gitbook.net 

testdb=# SELECT * FROM COMPANY WHERE AGE >= 25 OR SALARY >= 6500; www.gitbook.net

傖婪PostgreSQL䔇臘嚔库䫘傖婋䂷悩 gitbook.net 

 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
  8 | Paul  |  24 | Houston     |  20000
  9 | James |  44 | Norway      |   5000
 10 | James |  45 | Texas       |   5000
(10 rows)
 gitbook.net

婋麵䔇SELECT臺埖彖臘幘醇婉婺NULL認懟叿五欔橬螄嘘婋準啹婺螄嘘滇澇橬幘醇京庯NULL www.gitbook.net 

testdb=#  SELECT * FROM COMPANY WHERE SALARY IS NOT NULL; www.gitbook.net

傖婪PostgreSQL䔇臘嚔库䫘傖婋䂷悩

gitbook.net

 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
  8 | Paul  |  24 | Houston     |  20000
  9 | James |  44 | Norway      |   5000
 10 | James |  45 | Texas       |   5000
(10 rows) 
gitbook.net
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橸桺湺鵻PostgreSQL锂膏誊䞖严
蘸蘘臙媺䘍寘桺鷆毖:http://www.gitbook.net/html/postgresql/2013/080554.html
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