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 * 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>
    


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datalength(Char_expr) ·µ»Ø×Ö·û´®°üº¬×Ö·ûÊý,µ«²»°üº¬ºóÃæµÄ¿Õ¸ñ
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right(char_expr,int_expr) ·µ»Ø×Ö·û´®ÓÒ±ßint_expr¸ö×Ö·û
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upper(char_expr) תΪ´óд
lower(char_expr) תΪСд
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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 ......

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select round(748.585929,-1) 750.000000
select round(748.58592 ......

SQL UnionºÍUnion AllµÄʹÓ÷½·¨

¡¡UNIONÖ¸ÁîµÄÄ¿µÄÊǽ«Á½¸öSQLÓï¾äµÄ½á¹ûºÏ²¢ÆðÀ´¡£´ÓÕâ¸ö½Ç¶ÈÀ´¿´£¬ ÎÒÃÇ»á²úÉúÕâÑùµÄ¸Ð¾õ£¬UNION¸úJOINËÆºõÓÐЩÐíÀàËÆ£¬ÒòΪÕâÁ½¸öÖ¸Áî¶¼¿ÉÒÔÓɶà¸ö±í¸ñÖÐߢȡ×ÊÁÏ¡£ UNIONµÄÒ»¸öÏÞÖÆÊÇÁ½¸ö SQL Óï¾äËù²úÉúµÄÀ¸Î»ÐèÒªÊÇͬÑùµÄ×ÊÁÏÖÖÀà¡£ÁíÍ⣬µ±ÎÒÃÇÓà UNIONÕâ¸öÖ¸Áîʱ£¬ÎÒÃÇÖ»»á¿´µ½²»Í¬µÄ×ÊÁÏÖµ (ÀàËÆ SELECT DISTINCT) ......
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