mysql²éѯÎÊÌâ
bas_car ±í ÓÐÁÐcarname £¬Òª½øÐÐÊý¾Ýͳ¼Æ£¬
select count(a.carname),a.carname from bas_car a,bas_car b where a.carid>=b.carid and a.carname=b.carname
group by a.carname
ÈçÉϲéѯ½á¹û¡£ ÎÒÏÖÔÚÒªÔÚ½á¹ûÖвúÉúÒ»ÁÐÐÂÐòºÅÁУ¬Èç 1£¬2£¬3£¬4£¬5.
sqlserverÖÐÓÐrow_number() over() ¿ÉÒÔʵÏÖ¡£
select count(a.carname),row_number() over(ordery by count(carname) ) as ÐòºÅ,a.carname from bas_car a,bas_car b where a.carid>=b.carid and a.carname=b.carname group by a.carname ¿ÉÒÔʵÏÖ¡£
mysqlÔõôŪ¡£°ï°ï棬´ó¼Ò¡£ Óе㼱¡£¡£
Äܲ»ÄÜÖ±½ÓÏósqlÖÐÒ»Ñù¡£ ÓøösqlÓï¾ä¾Í²éѯ³öÀ´µÄ£¿
ÎÒÊÇÐÂÈË£¬¶ÔÕâ¸öº¯ÊýÖ®ÀàµÄ²»ÊÇÌ«Àí½â¡£
²»Ôõô»áÓÃ
ѧϰ
{{
Ïà¹ØÎÊ´ð£º
±àÒëÆ÷£ºC-Free4
mysql µ¥¶À°²×°µÄ£¬ÏÖÔÚΪapache+php+mysql¿ÉÒÔʹÓá£
×î½üÔÚÁ·Ï°c£¬c++£»ÏëÓÃc£¬c++Á¬½ÓÏÂÎÒµÄmysql£¬ºÃ¶àµØ·½¶à˵mysql.hÕÒ²»µ½¡£¶øÇÒÎÒmysqlûÓÐËùνµÄincludeÎļþ¼Ð°¡¡£
Íü¸ßÊÖÖ¸µãÒ»¶ ......
ÎÒµÄMysql ʹÓõÄʱºò ÓÃdos½¨Á¢µÄÊý¾Ý±í ÔÚdosÖÐÄÜÏÔʾ³öÖÐÎÄ
µ«ÊÇÔÚ ÆäËûµÄ¿ÉÊÓÒ³Ãæ ºÍÍøÒ³Öж¼ÏÔʾÂÒÂë ÈçºÎ½â¾ö£¿
ÔÚmysql¿ØÖÆÌ¨:show variables like 'char%';Ìù½á¹û³öÀ´¿´¿´¡£
mysqlÃüÁîÐÐģʽÏÂ: ......
ÎÒÊÇÐÂÊÖ£¬³õѧMYSQL£¬Óкܶ಻¶®£¬Íû´Í½Ì£¡£¡
±ÈÈç˵ÎÒн¨Ò»¸öMYSQLÊý¾Ý¿âUSER Êý¾Ý¿âÖÐÓбíLIST
È»ºóÎÒÔÚVCÖÐн¨Ò»¸öMFC¶Ô»°¿ò¹¤³Ì£¬È»ºóÎÒÔõôÑù²ÅÄÜÓÃVC»ñµÃÊý¾Ý¿âÖбíµÄÊý¾Ý£¿
Ï£Íû¸ø³ö¾ßÌåµÄ²Ù×÷² ......
ÎÒ¼¸ÕÅmysql±í ·ÖÇø
È»ºó°Ñ·ÖÇø±íµ¥¶À¿½³öÀ´
ÀýÈ磺test.MYD test.MYI data.MYD data.MYI user.MYD user.MYI dem.MYD dem.MYI
ÎÒÏë¶ÁÈ¡ÕâËÄÕűíµÄÄÚÈÝ
¹ØÁªÊý¾ÝÕûºÏµ½Ò»ÕűíÖС£Õâ¸öÒªÔõô×öÄØ
ÓóÌÐòÔ ......
±¾ÈËÏëÖªµÀMySqlÔõôÔÚÊý¾Ý°²×°µÄʱºò¾ÍÄÜ×Ô¶¯È¥Éú³ÉһЩĬÈϵÄÓû§ºÍȨÏÞÄØ£¨Óû§£ºClient£¬ÃÜÂ룺12345£©£¿
±ÈÈçÊDz»ÊÇÐèҪд×Ô¶¯°²×°½Å±¾°¢£¿µÈµÈ£¬Ð»Ð»£¡
MySQLµÄ±ê×¼°²×°£¬»òÕ߷ǰ²×°°æ±¾Öв»»á°ïÄã´´½¨ÕâЩ ......