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ÀýÈçÏÂÃæÕâ¾ä£º  string readstring = "select * from ʵÀý where ʵÀýID='"+eid+"'";
È»ºóÖ´ÐÐ Myconnection();
        DataSet ds = new DataSet();
        OleDbDataAdapter da = new OleDbDataAdapter(readstring, Mycon);
Õâʱºò¾Í»á±¨´í¡£¡£²»ÊÇ˵“sqlÓï¾äÓд픣¬¾ÍÊÇ“Êý¾ÝÀàÐͲ»Æ¥Å䔣¬¸üÂé·³µÄÊÇ£¬ÔËÐгɹ¦ÁË£¬µ«ÊÇÔËÐеĽá¹ûÒ»Ö±ÓÐ´í¡£¡£
ºóÀ´£¬²Å·¢ÏÖÔ­À´Èç¹ûÁ¬½ÓµÄÊÇacessµÄ»°£¬ÒÔÉϵÄÕâ¾äsqlÊÇÒª±ä³ÉÏÂÃæÕâÑùдµÄ£º
 string readstr = "select * from ʵÀý where ʵÀýID=";
 string readstring = readstr + eid;
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      int eid = Form1.int_selected + 1;
        string readstr = "select * from ʵÀý where ʵÀýID=";
        string readstring = readstr + eid;
        Myconnection();//Á¬½ÓÊý¾Ý¿â
        DataSet ds = new DataSet();
        OleDbDataAdapter da = new OleDbDataAdapter(readstring, Mycon);
        da.Fill(ds, "ʵÀý");
         qbox1.Text = ds.Tables[0].Rows[0][3].ToString();
        dxbox1.Text = ds.Tables[0].Rows[0][4].ToString();


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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
space(int_expr) Éú³Éint_expr¸ö¿Õ¸ñ ......

SQL ServerÈÕÆÚ

---Ò»¸öÔµĵÚÒ»Ìì
SELECT DATEADD(mm, DATEDIFF(mm,0,getdate()), 0) 
--- ±¾ÖܵÄÐÇÆÚÒ»
SELECT DATEADD(wk, DATEDIFF(wk,0,getdate()), 0)
---Ò»ÄêµÄµÚÒ»Ìì
SELECT DATEADD(yy, DATEDIFF(yy,0,getdate()), 0)
----¼¾¶ÈµÄµÚÒ»Ìì
SELECT DATEADD(qq, DATEDIFF(qq,0,getdate()), 0)
----ÉϸöÔµÄ×îºóÒ»Ìì
......

SQL Serverº¯Êý´óÈ«

--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 ......

SQLÓï¾ä£ºGroup By Óï¾äС½á

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 ......

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num_field   number(12,2); 
±íʾnum_fieldÊÇÒ»¸öÕûÊý²¿·Ö×î¶à10λ¡¢Ð¡Êý²¿·Ö×î¶à2λµÄ±äÁ¿¡£ 
case.....when Ó÷¨£¨Óëdecode£¨£©×÷ÓúÜÏñ£©
select case zsxm_dm
         when '02' then
          'Ó ......
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