SQL »ù±¾²Ù×÷ ɾ³ý ÐÞ¸Ä Ë¢Ð Ð޸İæ
	
    
    
	C# Êý¾Ý¿âÖ®ÂÃ……
¼ÌÐø½ø¹¥²ã³ö²»ÇîµÄproblems
ÔÚÉÏһƪÄÚÈݵĻù´¡ÉÏ£¬ÎÒÓÖ×÷ÒԸĽø£¬ÏÖÔÚµÄÇé¿öÊÇÕâÑùµÄ£º
 //In Browseuser form
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Configuration;
using System.Data.SqlClient;
namespace Str
{
    public partial class Browseuser : Form
    {
        public Browseuser()
        {
            InitializeComponent();
        }
        
        //define Êý¾Ý¼¯¶ÔÏódsÓÃÓÚ±£´æ²éѯ·µ»ØµÄ½á¹û¼¯
        DataSet ds;
        private void Browseuser_Load(object sender, EventArgs e)
        {
            string strConnection = ConfigurationSettings.AppSettings["connectionstring"];
            SqlConnection objConnection = new SqlConnection(strConnection);
            objConnection.Open();
            string sql = "select userid as userid,name as name from judging";
            SqlDataAdapter adp = new SqlDataAdapter(sql, objConnection);
            ds = new DataSet();
            ds.Clear();
            adp.Fill(ds, "judging");
            dataGridView1.DataSource=ds. Tables[0].DefaultView;
            dataGridView1.Refresh();
            this.judgingTableAdapter.Fill(this.masterDataSet.judging);
        }
        /**********************************************************************************************/
        /*ÖÁ´ËÍê³ÉÁ˽«Êý¾Ý¿âjudgingÖеÄÄÚÈÝÈ«²¿ÏÔʾÔÚÐÂform——BrowseuserÉÏ*/
        /**********************************************************************************************/
        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
        }
        private void button3_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        //define a delegate instance in order to refresh
        delegate void UseF();
        /****************
    
     
	
	
    
    
	Ïà¹ØÎĵµ£º
        
    
    1¡¢join
A±íµÄÖ÷¼üÊÇ×÷ΪB±íµÄÍâ¼ü¡£ÔÚ²éѯµÄʱºò£¬¿ÉÒÔͨ¹ý²»Í¬µÄjoin½«AºÍB±íÁ´½ÓÆðÀ´£¬´Ó¶øµÃµ½²»Í¬µÄ²éѯ½á¹û¡£
* JOIN: Èç¹û±íÖÐÓÐÖÁÉÙÒ»¸öÆ¥Å䣬Ôò·µ»ØÐÐ
* INNER JOIN: Èç¹ûÁ½¸ö±íÖÐÓÐÆ¥ÅäµÄ£¬Ôò·µ»ØÐР          
* LEFT JOIN: ¼´Ê¹ÓÒ±íÖÐûÓÐÆ¥Å䣬Ҳ´Ó×ó± ......
	
    
        
    
    ÔÚwindows XP SP3 ÖÐÊÇ¿ÉÒÔ°²×° SQL Server 2005 µÄ²»»áÓмæÈÝÎÊÌâ ÎÒÔÚ°²×°µÄʱºò¾ÍʲôÎÊÌⶼû¿´µ½ °²×°ºÃºó¸½¼ÓÒ»¸öÊý¾Ý¿â ÓÃBorland JBuilder 2006 Enterprise ºÍeclipse ҲûÎÊÌâ
SQL2005 ·ÖÎå¸ö°æ±¾£¬ÈçÏÂËùÁУ¬
¡¡¡¡1.Enterprise(ÆóÒµ°æ),
  2.Development(¿ª·¢°æ),
¡¡¡¡3.Workgroup,(¹¤×÷Ⱥ°æ)
¡¡¡¡4.St ......
	
    
        
    
    ¾ßÌåҪעÒâµÄ£º  
1.Ó¦¾¡Á¿±ÜÃâÔÚ where ×Ó¾äÖжÔ×ֶνøÐÐ null ÖµÅжϣ¬·ñÔò½«µ¼ÖÂÒýÇæ·ÅÆúʹÓÃË÷Òý¶ø½øÐÐÈ«±íɨÃ裬È磺  
select id from t where num is null  
¿ÉÒÔÔÚnumÉÏÉèÖÃĬÈÏÖµ0£¬È·±£±íÖÐnumÁÐûÓÐnullÖµ£¬È»ºóÕâÑù²éѯ£º  
select id from t where num=0 &n ......
	
    
        
    
    ¸Õ×°ÍêÊý¾Ý¿â¾Í±»ÈË·è¿ñɨÃèsa£¬ÎÞ±ÈÓôÃÆ¡£
¸ÄsaÃû³Æ£¬1433¶Ë¿ÚºÅ£¬ÒòΪ¿ª·¢ÐèÒª»¹±ØÐë´ò¿ªÔ¶³ÌÁ¬½Ó£¬½á¹ûÔÚ¿Í»§¶ËÎÞÂÛÈçºÎ¶¼²»ÄÜÁ¬½ÓÉÏ·þÎñÆ÷¡£
¿ñº¹Çë°Ù¶È´óÉñ³öÂí£¬°Ñ¸÷ÖÖÅäÖÃÁ·Á˸öÊ죬½á¹û»¹ÊÇû½â¾ö¡£
¸ãЦµÄÊÇ×îºóÎÞÒâÖÐÔÚMicrosoftÂÛ̳ÉÏ¿´µ½Õâôһ¾ä£¬ÐÞ¸ÄÍê¶Ë¿ÚºÅ£¬ÔÚ¿Í»§¶ËµÇ¼µÄʱºòÒªÔÚIPºóÃæ£«¶ººÅ£«¶Ë¿Úº ......
	
    
        
    
    ÔÚ¹¤×÷ÖÐÓöµ½Ò»¸öÎÊÌâ,ÊÇÐèÒªsqlµÝ¹é²éѯµÄ.²»¶®,ÓÚÊǵ½csdnÉÏÈ¥ÎÊ,ÄÇÀïµÄЧÂÊÕæÊǷdz£¸ß,ÎÒÒÔǰҲûÔÚÉÏÃæÎʹýÎÊÌâ.
ÎÊÌâÃèÊö:
ÎÒÓÐÒ»¸ö±í½á¹¹ÈçÏÂ:
id upperid
1     2
3     2
4     1
5     3
¾ßÌå²ã´Î²»ÖªµÀ,ÎÒÏëÓõݹésqlÓ ......