Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

SQL¾ÛºÏº¯


SQL¾ÛºÏº¯
±êÇ©£ºsql¾ÛºÏº¯Êý ÔÓ̸ 
 
¾ÛºÏº¯Êý£º
1.AVG ·µ»Ø×éÖÐµÄÆ½¾ùÖµ£¬¿ÕÖµ½«±»ºöÂÔ¡£
ÀýÈ磺use  northwind   // ²Ù×÷northwindÊý¾Ý¿â
   Go
   Select  avg (unitprice)   //´Ó±íÖÐÑ¡ÔñÇóunitpriceµÄƽ¾ùÖµ
      from  products
      Where  categoryid = ‘8’
2£® BINABY_CHECKSUM  ¿ÉÓÃÓÚ¼ì²â±íÖÐÐеĸü¸Ä
·µ»ØÖµÓɱí´ïʽµÄÔËËã½á¹ûÀàÐ;ö¶¨
ÀýÈ磺use northwind
             Go
      Create  table  tablebc(productid int,bchecksum int)   //½¨Á¢ÓÐÁ½¸öÊôÐԵıí
      Insert  into tablebc   //Ïò±íÖвåÈëÊý¾Ý
          Select  priductid,binary_checksum(*)
          from  products
    Update  products   //¸üÐÂ
      Set  productname=’oishi tofu’, unitprice=20 where  productname = ‘tofu’
  
   Update  products   //¸üÐÂ
   Set  priductname=’oishi konbu’, unitprice = 5 where priductname=’konbu’
      Update priducts     //¸üÐÂ
   Set  prodctname=’oishi genen shouyu’, unitprice =12
           Where priductname=’genen shouyu’          
     Select  productid    //Ìô³ö±ä»¯µÄÐÐ
    from tablebc
    Where exists (
Select productid from products
Where  product.productid = tablebc.productid and
binary_checksu (*) <> tablebc.bchecksum)  //±êÖ¾³ö±ä»¯µÄÐÐ
3.CHECKSUM


Ïà¹ØÎĵµ£º

java¡¢C#ÖÐSqlÓï¾ä´«²ÎµÄд·¨¼°ÒâÒå

 SqlserverÕâ¶«Î÷ûÉÙ¸úËû´ò½»µÀ,¸Õѧ¿ª·¢ÓïÑÔʱ¾ÍÒѾ­¸úËû½Ó´¥ÁË,²»ÒªËµºÜ¾«Í¨,µ«¾ÍÓï·¨»¹ËãÊÇÊìϤ,µ«ÏÖÔÚ¿ªÊ¼Ð´C#,·¢ÏÖºÜC#¶àÁËÒ»ÖÖSqlServerµÄ²ÎÊý´«È뷽ʽ,ÒÔÍùÎÒÃdz£³£¶ÔÒª´«²ÎµÄSqlÓï¾ä¶¼ÊÇÖ±½Óͨ¹ýÆ´´ÕSqlÓï¾äµÄ·½Ê½À´ÊµÏÖ,µ«ÏÖÔÚC#ΪʲôҪרÃÅ×öÒ»¸öSql²ÎÊýµÄÀàÀ´ÊµÏÖÄØ,¾­¹ý²éÕÒ²ÅÖªµÀ,ÕâÑù×öÊÇÓеÀÀíµÄ,Ò»Ê ......

sqlÓÅ»¯ ¶Ôlike ¡®%xx%¡¯ µÄÌæ»»

ÔÚSQLÖпÉÒÔʹÓÃLike½øÐÐÄ£ºý²éѯ£¬ÀýÈç f_stuname like 'a%' ²éѯf_stunameÁÐÒÔa¿ªÍ·µÄ¼Ç¼¡£
µ±ÎÒÃÇÔÚÓ¦ÓÃÖÐʹÓÃ
f_stuname
like '%a%' ʱ£¬Èç¹û

f_stunameÓÐË÷ÒýµÄ»°£¬Õâ¸öË÷ÒýÒ²ÊDz»Ö´ÐеÄ
ÔÚSQLÓÅ»¯ÖÐÕâ¸öд·¨¾ÍÊÇÒ»¸ö²»ºÃµÄSQLÁË¡£
ÄÇôÈçºÎÀ´Ìæ»»Õâ¸öÄØ£¬ÕâÒ»¸ö¾ÍÓõ½ÁËOracleµÄinstrº¯ÊýÁË
ÎÒÃÇ¿ÉÒÔÕâÑù ......

SQL SERVERµÄÊý¾ÝÀàÐÍÁíÒ»°æ×ܽá

1.SQL SERVERµÄÊý¾ÝÀàÐÍ
¡¡¡¡Êý¾ÝÀàŪÊÇÊý¾ÝµÄÒ»ÖÖÊôÐÔ£¬±íʾÊý¾ÝËù±íʾÐÅÏ¢µÄÀàÐÍ¡£ÈκÎÒ»ÖÖ¼ÆËã»úÓïÑÔ¶¼¶¨ÒåÁË×Ô¼ºµÄÊý¾ÝÀàÐÍ¡£µ±È»£¬²»Í¬µÄ³ÌÐòÓïÑÔ¶¼¾ßÓв»Í¬µÄÌØµã£¬Ëù¶¨ÒåµÄÊý¾ÝÀàÐ͵ĸ÷ÀàºÍÃû³Æ¶¼»ò¶à»òÉÙÓÐЩ²»Í¬¡£SQLServer ÌṩÁË 25 ÖÖÊý¾ÝÀàÐÍ£º
¡¡¡¡·Binary [(n)]
¡¡¡¡·Varbinary [(n)]
¡¡ ......

´Ó¡¾¸÷´óÈí¼þ¹«Ë¾±ÊÊÔѹÖáÌ⡿ѧϰSQLÓï¾ä

´Ó²©¿ÍÔ°Öп´µ½Ò»ÆªÎÄÕ£¬½éÉÜ´óÈí¼þ¹«Ë¾ÃæÊÔʱ³£³£»á³öµÄÁ½µÀSQLÌ⣨¼û¸½Â¼£©¡£
ÎÒ¾õµÃÊÜÒæºÜ¶à£¬ÔÚ´Ë֮ǰ£¬ÎÒÒ»Ö±¾õµÃ£¬SQL2008ËÆºõÌṩÁËÕâ·½ÃæµÄÖ§³Ö£¬µ«¸üµÍµÄ°æ±¾£¬°üÀ¨2005£¬·ÇÓαê×ö²»³öÀ´£¨Ë®Æ½¹»²Ë£©¡£×ܽáÐĵÃÈçÏ£º
1¡¢    Ç¿´óµÄgroup by
1  select stdname,
2  isnull(sum( ......

ÔÚVB2008 ËٳɰæÖÐʹÓòÎÊý»¯SQL²éѯÓï¾äÎÞЧ

  ×î½ü¸Õѧ»áÔÚVB2008 ÖÐʹÓòÎÊý»¯SQLÓï¾ä£¬ÓÚÊÇÂíÉÏÓõ½´úÂëÖУ¬È´Åöµ½²é²»µ½ÈκÎÊý¾ÝµÄÇé¿ö£¬¾À½áÁ˺ü¸Ì죬»¹ÊÇûÓиãÃ÷°×£¬²îµãÍÂѪ¡£²»µÃÒÑ»¹ÊÇÏÈÔÚ´úÂëÖÐʹÓÃ×Ö·û´®Æ´½ÓµÄSQLÓï¾ä¡£
  °üº¬²ÎÊý»¯SQLÓï¾äµÄ´úÂëÈçÏ£º
            Dim cmSl As N ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ