SQLÓï¾äÓÅ»¯
¶ÔͬһÕÅ±í½øÐÐÁ½ÖÖ·½Ê½²éѯ£¨½á¹û¼¯Ïàͬ£©£º
case1 ²éѯÌõ¼þ:°üÀ¨¼ÆËã»úÃû£¬êdzƣ¬Ìí¼Óʱ¼äµÈµÈһЩÏÞÖÆÌõ¼þ×ֶΡ£¶øÇÒÐèÁª±í²éѯ±ðµÄ±í
²éѯÊý¾ÝÁ¿£º 100Íò 200Íò
µ¥´¿Ö´ÐÐSQLÓï¾äËùÐèʱ¼ä£º31ºÁÃë 31ºÁÃë
Ñ»·±éÀúÊý¾Ý¼¯ËùÐèʱ¼ä£º 57Ãë 1·Ö50Ãë
case 2²éѯÌõ¼þ£ºÎÞ
select * from ¡¾±í¡¿
²éѯÊý¾ÝÁ¿£º 100Íò 200Íò
µ¥´¿Ö´ÐÐSQLÓï¾äËùÐèʱ¼ä£º31ºÁÃë 31ºÁÃë
Ñ»·±éÀúÊý¾Ý¼¯ËùÐèʱ¼ä£º 20Ãë 40Ãë
×¢ÒâÏÂÑ»·±éÀúÊý¾Ý¼¯Ê±¼ä£¨×ÝÏò100ÍòµÄ£¬»òÕß200ÍòµÄ¶¼ÐУ©£¬²éѯÌõ¼þ²»Ò»Ñù£¬¾¡¹Ü×îÖÕ²éѯÊý¾ÝÁ¿ÊÇÒ»ÑùµÄ£¬µ«ÊDZéÀúʱ¼ä²î±ðºÜ´ó¡£
ÎªÊ²Ã´ÄØ£¿
¿É²»¿ÉÒÔÕâôÀí½â£¬SQLÓï¾äÔ½¸´ÔÓ£¨»òÕß˵ÓÅ»¯³Ì¶ÈûÄÇô¸ß£©£¬Ó°ÏìµÄ²»ÊÇSQL±¾ÉíµÄÖ´ÐУ¬¶øÊÇÊý¾ÝµÄÌáÈ¡ÄØ£¿
Ïà¹ØÎĵµ£º
ϵͳ»·¾³£ºWindows 7
Èí¼þ»·¾³£ºVisual C++ 2008 SP1 +SQL Server 2005
±¾´ÎÄ¿µÄ£º±àдһ¸öº½¿Õ¹ÜÀíϵͳ
ÕâÊÇÊý¾Ý¿â¿Î³ÌÉè¼ÆµÄ³É¹û£¬ËäÈ»³É¼¨²»¼Ñ£¬µ«ÊÇ×÷ΪÎÒÓÃVC++ ÒÔÀ´±àдµÄ×î´ó³ÌÐò»¹ÊÇ´«µ½ÍøÉÏ£¬ÒÔ¹©²Î¿¼¡£ÓÃVC++ ×öÊý¾Ý¿âÉè¼Æ²¢²»ÈÝÒ×£¬µ«Ò²²»ÊDz»¿ÉÄÜ¡£ÒÔÏÂÊÇÎҵijÌÐò½çÃæ£¬ºóÃæ ......
Sql ServerÖеÄÈÕÆÚÓëʱ¼äº¯Êý
1. µ±Ç°ÏµÍ³ÈÕÆÚ¡¢Ê±¼ä
select getdate()
2. dateadd ÔÚÏòÖ¸¶¨ÈÕÆÚ¼ÓÉÏÒ»¶Îʱ¼äµÄ»ù´¡ÉÏ£¬·µ»ØÐ嵀 datetime Öµ
ÀýÈ磺ÏòÈÕÆÚ¼ÓÉÏ2Ìì
select dateadd(day,2,'2004-10-15') --·µ»Ø£º2004-10-17 00:00:00.000
......
SELECT ROWNUM AS ID
,TO_CHAR(SYSDATE + ROWNUM / 24 / 3600, 'yyyy-mm-dd hh24:mi:ss') AS INC_DATETIME
,TRUNC(DBMS_RANDOM.VALUE(0, 100)) AS RANDOM_ID
,DBMS_RANDOM.STRING('x', 20) RANDOM_STRING
from DUAL
CONNECT BY LEVEL <= 10;
SELECT '('||WMSYS.WM_CONCAT(':P' || ROWNUM)| ......
SQLº¯Êý
ÔÚSQLÖУ¬º¯Êý¶ÔÊý¾Ý»òÊý¾Ý×éÖ´ÐвÙ×÷£¬È»ºó·µ»ØÐèÒªµÄÖµ¡£º¯Êý±í´ïʽ¿ÉÒÔ³öÏÖÔÚSELECTÁбíÖУ¬»òÕß
ÔÚÈκÎÔÊÐí³öÏÖµÄλÖÃÉÏ¡£SQL°üº¬ÁËÆßÖÖº¯Êý:
(1)¾ÛºÏº¯Êý:·µ»Ø»ã×ÜÖµ¡£
(2)תÐͺ¯Êý:½«Ò»ÖÖÊý¾ÝÀàÐÍת»»ÎªÁíÍâÒ»ÖÖ¡£
(3)ÈÕÆÚº¯Êý:´¦ÀíÈÕÆÚºÍʱ¼ä¡£
(4)Êýѧº¯Êý:Ö´ÐÐËãÊõÔËËã¡£
(5)×Ö·û´®º¯Êý:¶Ô×Ö·û´ ......
use Dbname
go
select
[±íÃû]=c.Name,
[±í˵Ã÷]=isnull(f.[value],''),
[ÁÐÃû]=a.Name,
[ÁÐÐò號]=a.Column_id,
&nbs ......