±¸·ÝºÍ»¹ÔSQL Server¼°Ñ¹ËõAccessÊý¾Ý¿â
*
* ¹¦ÄÜ˵Ã÷:±¸·ÝºÍ»Ö¸´SQL ServerÊý¾Ý¿â
* ×÷Õß: Áõ¹¦Ñ«;
* °æ±¾:V0.1(C#2.0);ʱ¼ä:2007-1-1
* µ±Ê¹ÓÃSQL Serverʱ,ÇëÒýÓà COM×é¼þÖеÄ,SQLDMO.dll×é¼þ
* µ±Ê¹ÓÃAccessÖÐ,Çëä¯ÀÀÌí¼ÓÒýÓÃÒÔÏÂÁ½¸ödll
* ÒýÓÃC:/Program Files/Common Files/System/ado/msadox.dll,¸ÃDLL°üº¬ADOXÃüÃû¿Õ¼ä
* ÒýÓÃC:/Program Files/Common Files/System/ado/msjro.dll,¸ÃDLL°üº¬JROÃüÃû¿Õ¼ä
* *******************************************************************************/
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using ADOX;//¸ÃÃüÃû¿Õ¼ä°üº¬´´½¨ACCESSµÄÀà(·½·¨)--½â¾ö·½°¸ ==> ÒýÓà ==> Ìí¼ÓÒýÓà ==> ÓÎÀÀÕÒµ½.dll
using JRO;//¸ÃÃüÃû¿Õ¼ä°üº¬Ñ¹ËõACCESSµÄÀà(·½·¨)
namespace EC
{
/// <summary>
/// Êý¾Ý¿â»Ö¸´ºÍ±¸·Ý
/// </summary>
public class SqlBackObject
{
public SqlBackObject()
{
//
// TODO: ÔÚ´Ë´¦Ìí¼Ó¹¹Ô캯ÊýÂß¼
//
}
#region SQLÊý¾Ý¿â±¸·Ý
/// <summary>
/// SQLÊý¾Ý¿â±¸·Ý
/// </summary>
/// <param name="ServerIP">SQL·þÎñÆ÷IP»ò(Localhost)</param>
 
Ïà¹ØÎĵµ£º
ÕâÖÖÓ÷¨ÏàÐÅÔÚÍøÕ¾Öо³£Ê¹Óã¬ÈçÒªÔÚ±íÖÐËæ»úÈ¡³ö10Ìõ¼Ç¼£¬Èç¹ûʹÓñà³ÌÓïÑÔ½øÐÐÔËËãµÄ»°»áºÜÂé·³¶øÇÒЧÂʵÍÏ¡£ÔÚSql ServerÖÐ×Ô´øÁËrandom()º¯ÊýÓÃÓÚÉú³ÉËæ»úÊý£¬ÆäʵËü»¹×Ô´øÁËÁíÍâÒ»¸öËæ»úº¯Êýnewid();newid()ÔÚɨÃèÿÌõ¼Ç¼ʱ¶¼»áÉú³ÉÒ»¸öËæ»úµÄÖµ£º
Ö´ÐÐselect newid()£»ÔËÐнá¹û
¿ÉÒÔ¿´µ½Õâ²¢²»ÊÇÒ»¸öËæ»úµÄÊý× ......
--¾ÛºÏº¯Êý
use pubs
go
select avg(distinct price) --ËãÆ½¾ùÊý
from titles
where type='business'
go
use pubs
go
select max(ytd_sales) --×î´óÊý
from titles
go
use pubs
go
select min(ytd_sales) --×îÐ¡Ê ......
ÐÐÁÐת»»
create table test(id int,name varchar(20),quarter int,profile int)
insert into test values(1,'a',1,1000)
insert into test values(1,'a',2,2000)
insert into test values(1,'a',3,4000)
insert into test values(1,'a',4,5000)
insert into test values(2,'b',1,3000)
insert into test values(2, ......
SQLÖÐround£¨£©º¯ÊýÓ÷¨
SQL round()Ïê½â
roundÓÐÁ½¸öÖØÔØ,Ò»¸öÓдøÓÐÁ½¸ö²ÎÊýµÄ,Ò»¸öÊÇ´øÓÐÈý¸ö²ÎÊýµÄ,
ÿһ¸ö²ÎÊý¶¼ÏàͬÊÇÒª´¦ÀíµÄÊý,
1.´øÓÐÁ½¸ö²ÎÊý.ÿ¶þ¸ö²ÎÊýÊÇСÊýµãµÄ×ó±ßµÚ¼¸Î»»òÓұߵڼ¸Î»,·Ö±ðÓÃÕý¸º±íʾ.×ó±ßΪ¸º,ÓÒ±ßΪ¸º.ΪËÄÉáÎåÈë.
select round(748.585929,-1) 750.000000
select round(748.58592 ......
1. Group By Óï¾ä¼ò½é£º
Group ByÓï¾ä´ÓÓ¢ÎĵÄ×ÖÃæÒâÒåÉÏÀí½â¾ÍÊÇ“¸ù¾Ý(by)Ò»¶¨µÄ¹æÔò½øÐзÖ×é(Group)”¡£ËüµÄ×÷ÓÃÊÇͨ¹ýÒ»¶¨µÄ¹æÔò½«Ò»¸öÊý¾Ý¼¯»®·Ö³ÉÈô¸É¸öСµÄÇøÓò£¬È»ºóÕë¶ÔÈô¸É¸öÐ¡ÇøÓò½øÐÐÊý¾Ý´¦Àí¡£
P.S. ÕâÀïÕæÊÇÌå»áµ½ÁËÒ»¸öºÃµÄÃüÃûµÄÁ¦Á¿£¬Group By´Ó×ÖÃæÊÇÖ±½ÓÈ¥Àí½âÊǷdz£ºÃÀí½âµÄ¡£¶÷£¬ÒÔºóÔÚÃü ......