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jiang jie MySQL suo yin de gai nian ji shu ju ku suo yin de ying yong

2008-06-01 03:18:43 编辑來源:互联网 评论
 
 
 
本文为【讲解MySQL索引的概念及数据库索引的应用】的拼音翻译版
  1. shu ju ku yin ru le suo yin
  yong hu dui shu ju ku zui pin fan de cao zuo shi jin xing shu ju cha xun 。 yi ban qing kuang xia , shu ju ku zai jin xing cha xun cao zuo shi xu yao dui zheng ge biao jin xing shu ju sou suo 。 dang biao zhong de shu ju hen duo shi , sou suo shu ju jiu xu yao hen chang de shi jian , zhe jiu zao cheng le fu wu qi de zi yuan lang fei 。 wei le ti gao jian suo shu ju de neng li , shu ju ku yin ru le suo yin ji zhi 。
  2. you guan “ suo yin ” de bi yu
  cong mou zhong cheng du shang , ke yi ba shu ju ku kan zuo yi ben shu , ba suo yin kan zuo shu de mu lu , tong guo mu lu cha zhao shu zhong de xin xi , xian ran jiao mei you mu lu de shu fang bian 、 kuai jie 。
  3. shu ju ku suo yin shi ji shi shen me ?( liang bu fen zu cheng )
  suo yin shi yi ge dan du de 、 wu li de shu ju ku jie gou , ta shi mou ge biao zhong yi lie huo ruo gan lie zhi de ji he he xiang ying de zhi xiang biao zhong wu li biao shi zhe xie zhi de shu ju ye de luo ji zhi zhen qing dan 。
  4. suo yin zai biao zhong de jiao se
  yi ge biao de cun chu shi you liang bu fen zu cheng de , yi bu fen yong lai cun fang biao de shu ju ye mian , ling yi bu fen cun fang suo yin ye mian 。 suo yin jiu cun fang zai suo yin ye mian shang ,
  5. suo yin gao xiao yuan li
  tong chang , suo yin ye mian xiang dui yu shu ju ye mian lai shuo xiao de duo 。 dang jin xing shu ju jian suo shi , xi tong xian sou suo suo yin ye mian , cong zhong zhao dao suo xu shu ju de zhi zhen , zai zhi jie tong guo zhi zhen cong shu ju ye mian zhong du qu shu ju 。
  6. suo yin de fen lei
  zai SQL Server de shu ju ku zhong an cun chu jie gou de bu tong jiang suo yin fen wei liang lei : cu suo yin (Clustered Index) he fei cu suo yin (Nonclustered Index)。
  (1) cu suo yin dui biao de wu li shu ju ye zhong de shu ju an lie jin xing pai xu , ran hou zai chong xin cun chu dao ci pan shang , ji cu suo yin yu shu ju shi hun wei yi ti , de ta de ye jie dian zhong cun chu de shi shi ji de shu ju 。 you yu cu suo yin dui biao zhong de shu ju yi yi jin xing le pai xu , yin ci yong cu suo yin cha zhao shu ju hen kuai 。 dan you yu cu suo yin jiang biao de suo you shu ju wan quan chong xin pai lie le , ta suo xu yao de kong jian ye jiu te bie da , da gai xiang dang yu biao zhong shu ju suo zhan kong jian de 120% 。 biao de shu ju xing zhi neng yi yi zhong pai xu fang shi cun chu zai ci pan shang , suo yi yi ge biao zhi neng you yi ge cu suo yin 。
  (2) fei cu suo yin ju you yu biao de shu ju wan quan fen li de jie gou , shi yong fei cu suo yin bu yong jiang wu li shu ju ye zhong de shu ju an lie pai xu 。 fei cu suo yin de ye jie dian zhong cun chu le zu cheng fei cu suo yin de guan jian zi de zhi he xing ding wei qi 。 xing ding wei qi de jie gou he cun chu nei rong qu jue yu shu ju de cun chu fang shi 。 ru guo shu ju shi yi cu suo yin fang shi cun chu de , ze xing ding wei qi zhong cun chu de shi cu suo yin de suo yin jian ; ru guo shu ju bu shi yi cu suo yin fang shi cun chu de , zhe zhong fang shi you cheng wei dui cun chu fang shi (Heap Structure), ze xing ding wei qi cun chu de shi zhi xiang shu ju xing de zhi zhen 。 fei cu suo yin jiang xing ding wei qi an guan jian zi de zhi yong yi ding de fang shi pai xu , zhe ge shun xu yu biao de xing zai shu ju ye zhong de pai xu shi bu pi pei de 。 you yu fei cu suo yin shi yong suo yin ye cun chu yin ci ta bi cu suo yin xu yao geng duo de cun chu kong jian qie jian suo xiao lv jiao di dan yi ge biao zhi neng jian yi ge cu suo yin , dang yong hu xu yao jian li duo ge suo yin shi jiu xu yao shi yong fei cu suo yin le 。
  xiao jie :Clustered Index shi yu wu li shu ju hun zai yi qi bing dui wu li shu ju jin chong pai , jiu xiang shi yong pin yin cha zi dian ;Unclustered Index shi yu wu li shu ju wan quan fen li de , li yong e wai kong jian dui guan jian zi jin xing chong pai , jiu xiang shi yong bu shou cha zi dian 。
  shu ju ku suo yin ying yong
  yi 、 suo yin de gai nian
  suo yin jiu shi jia kuai jian suo biao zhong shu ju de fang fa 。 shu ju ku de suo yin lei si yu shu ji de suo yin 。 zai shu ji zhong , suo yin yuan xu yong hu bu bi fan yue wan zheng ge shu jiu neng xun su di zhao dao suo xu yao de xin xi 。 zai shu ju ku zhong , suo yin ye yuan xu shu ju ku cheng xu xun su di zhao dao biao zhong de shu ju , er bu bi sao miao zheng ge shu ju ku 。
  er 、 suo yin de te dian
  1. suo yin ke yi jia kuai shu ju ku de jian suo su du
  2. suo yin jiang di le shu ju ku cha ru 、 xiu gai 、 shan chu deng wei hu ren wu de su du
  3. suo yin chuang jian zai biao shang , bu neng chuang jian zai shi tu shang
  4. suo yin ji ke yi zhi jie chuang jian , ye ke yi jian jie chuang jian
  5. ke yi zai you hua yin cang zhong , shi yong suo yin
  6. shi yong cha xun chu li qi zhi xing SQL yu ju , zai yi ge biao shang , yi ci zhi neng shi yong yi ge suo yin
  7. qi ta
  san 、 suo yin de you dian
  1. chuang jian wei yi xing suo yin , bao zheng shu ju ku biao zhong mei yi xing shu ju de wei yi xing
  2. da da jia kuai shu ju de jian suo su du , zhe ye shi chuang jian suo yin de zui zhu yao de yuan yin
  3. jia su biao he biao zhi jian de lian jie , te bie shi zai shi xian shu ju de shen kao wan zheng xing fang mian te bie you yi yi 。
  4. zai shi yong fen zu he pai xu zi ju jin xing shu ju jian suo shi , tong yang ke yi xian zhu jian shao cha xun zhong fen zu he pai xu de shi jian 。
  5. tong guo shi yong suo yin , ke yi zai cha xun de guo cheng zhong shi yong you hua yin cang qi , ti gao xi tong de xing neng 。
  si 、 suo yin de que dian
  1. chuang jian suo yin he wei hu suo yin yao hao fei shi jian , zhe zhong shi jian sui zhe shu ju liang de zeng jia er zeng jia
  2. suo yin xu yao zhan wu li kong jian , chu le shu ju biao zhan shu ju kong jian zhi wai , mei yi ge suo yin huan yao zhan yi ding de wu li kong jian , ru guo yao jian li ju cu suo yin , na me xu yao de kong jian jiu hui geng da
  3. dang dui biao zhong de shu ju jin xing zeng jia 、 shan chu he xiu gai de shi hou , suo yin ye yao dong tai de wei hu , jiang di le shu ju de wei hu su du
  wu 、 suo yin fen lei
  1. zhi jie chuang jian suo yin he jian jie chuang jian suo yin
  zhi jie chuang jian suo yin : CREATE INDEX mycolumn_index ON mytable (myclumn)
  jian jie chuang jian suo yin : ding yi zhu jian yue shu huo zhe wei yi xing jian yue shu , ke yi jian jie chuang jian suo yin
  2. pu tong suo yin he wei yi xing suo yin
  pu tong suo yin :CREATE INDEX mycolumn_index ON mytable (myclumn)
  wei yi xing suo yin : bao zheng zai suo yin lie zhong de quan bu shu ju shi wei yi de , dui ju cu suo yin he fei ju cu suo yin dou ke yi shi yong
  CREATE UNIQUE COUSTERED INDEX myclumn_cindex ON mytable(mycolumn)
  3. dan ge suo yin he fu he suo yin
  dan ge suo yin : ji fei fu he suo yin
  fu he suo yin : you jiao zu he suo yin , zai suo yin jian li yu ju zhong tong shi bao han duo ge zi duan ming , zui duo 16 ge zi duan
  CREATE INDEX name_index ON username(firstname,lastname)
  4. ju cu suo yin he fei ju cu suo yin ( ju ji suo yin , qun ji suo yin )
  ju cu suo yin : wu li suo yin , yu ji biao de wu li shun xu xiang tong , shu ju zhi de shun xu zong shi an zhao shun xu pai lie
  CREATE CLUSTERED INDEX mycolumn_cindex ON mytable(mycolumn) WITH
  ALLOW_DUP_ROW( yuan xu you chong fu ji lu de ju cu suo yin )
  fei ju cu suo yin :CREATE UNCLUSTERED INDEX mycolumn_cindex ON mytable(mycolumn)
  liu 、 suo yin de shi yong
  1. dang zi duan shu ju geng xin pin lv jiao di , cha xun shi yong pin lv jiao gao bing qie cun zai da liang chong fu zhi shi jian yi shi yong ju cu suo yin
  2. jing chang tong shi cun qu duo lie , qie mei lie dou han you chong fu zhi ke kao lv jian li zu he suo yin
  3. fu he suo yin de qian dao lie yi ding hao kong zhi hao , fou ze wu fa qi dao suo yin de xiao guo 。 ru guo cha xun shi qian dao lie bu zai cha xun tiao jian zhong ze gai fu he suo yin bu hui bei shi yong 。 qian dao lie yi ding shi shi yong zui pin fan de lie
  4. duo biao cao zuo zai bei shi ji zhi xing qian , cha xun you hua qi hui gen ju lian jie tiao jian , lie chu ji zu ke neng de lian jie fang an bing cong zhong zhao chu xi tong kai xiao zui xiao de zui jia fang an 。 lian jie tiao jian yao chong fen kao lv dai you suo yin de biao 、 xing shu duo de biao ; nei wai biao de xuan ze ke you gong shi : wai ceng biao zhong de pi pei xing shu * nei ceng biao zhong mei yi ci cha zhao de ci shu que ding , cheng ji zui xiao wei zui jia fang an
  5.where zi ju zhong dui lie de ren he cao zuo jie guo dou shi zai sql yun xing shi zhu lie ji suan de dao de , yin ci ta bu de bu jin xing biao sou suo , er mei you shi yong gai lie shang mian de suo yin ; ru guo zhe xie jie guo zai cha xun bian yi shi jiu neng de dao , na me jiu ke yi bei sql you hua qi you hua , shi yong suo yin , bi mian biao sou suo ( li :select * from record where substring(card_no,1,4)=’5378’
  && select * from record where card_no like ’5378%’) ren he dui lie de cao zuo dou jiang dao zhi biao sao miao , ta bao kuo shu ju ku han shu 、 ji suan biao da shi deng deng , cha xun shi yao jin ke neng jiang cao zuo yi zhi deng hao you bian
  6.where tiao jian zhong de ’in’ zai luo ji shang xiang dang yu ’or’, suo yi yu fa fen xi qi hui jiang in (’0′,’1′) zhuan hua wei column=’0′ or column=’1′ lai zhi xing 。 wo men qi wang ta hui gen ju mei ge or zi ju fen bie cha zhao , zai jiang jie guo xiang jia , zhe yang ke yi li yong column shang de suo yin ; dan shi ji shang ta que cai yong le "or ce lue ", ji xian qu chu man zu mei ge or zi ju de xing , cun ru lin shi shu ju ku de gong zuo biao zhong , zai jian li wei yi suo yin yi qu diao chong fu xing , zui hou cong zhe ge lin shi biao zhong ji suan jie guo 。 yin ci , shi ji guo cheng mei you li yong column shang suo yin , bing qie wan cheng shi jian huan yao shou tempdb shu ju ku xing neng de ying xiang 。in、or zi ju chang hui shi yong gong zuo biao , shi suo yin shi xiao ; ru guo bu chan sheng da liang chong fu zhi , ke yi kao lv ba zi ju chai kai ; chai kai de zi ju zhong ying gai bao han suo yin
  7. yao shan yu shi yong cun chu guo cheng , ta shi sql bian de geng jia ling huo he gao xiao 。【原文】【汉音对照
 
 
 
 
 
 
 
 
 
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1. shu ju ku yin ru le suo yin yong hu dui shu ju ku zui pin fan de cao zuo shi jin xing shu ju cha xun 。 yi ban qing kuang xia , shu ju ku zai jin xing cha xun cao zuo shi xu yao dui zheng ge biao jin xing shu ju sou suo 。 dang biao zhong de shu ju hen duo shi , sou suo shu ju jiu xu yao hen chang de shi jian , zhe jiu zao cheng le fu wu qi de zi yuan lang fei 。 wei le ti gao jian suo shu ju de neng li , shu ju ku yin ru le suo yin ji zhi 。 2. you guan “ suo yin ” de bi yu cong mou zhong cheng du shang , ke yi ba shu ju ku kan zuo yi ben shu , ba suo yin kan zuo shu de mu lu , tong guo mu lu cha zhao shu zhong de xin xi , xian ran jiao mei you mu lu de shu fang bian 、 kuai jie 。 3. shu ju ku suo yin shi ji shi shen me ?( liang bu fen zu cheng ) suo yin shi yi ge dan du de 、 wu li de shu ju ku jie gou , ta shi mou ge biao zhong yi lie huo ruo gan lie zhi de ji he he xiang ying de zhi xiang biao zhong wu li biao shi zhe xie zhi de shu ju ye de luo ji zhi zhen qing dan 。 4. suo yin zai biao zhong de jiao se yi ge biao de cun chu shi you liang bu fen zu cheng de , yi bu fen yong lai cun fang biao de shu ju ye mian , ling yi bu fen cun fang suo yin ye mian 。 suo yin jiu cun fang zai suo yin ye mian shang , 5. suo yin gao xiao yuan li tong chang , suo yin ye mian xiang dui yu shu ju ye mian lai shuo xiao de duo 。 dang jin xing shu ju jian suo shi , xi tong xian sou suo suo yin ye mian , cong zhong zhao dao suo xu shu ju de zhi zhen , zai zhi jie tong guo zhi zhen cong shu ju ye mian zhong du qu shu ju 。 6. suo yin de fen lei zai SQL Server de shu ju ku zhong an cun chu jie gou de bu tong jiang suo yin fen wei liang lei : cu suo yin (Clustered Index) he fei cu suo yin (Nonclustered Index)。 (1) cu suo yin dui biao de wu li shu ju ye zhong de shu ju an lie jin xing pai xu , ran hou zai chong xin cun chu dao ci pan shang , ji cu suo yin yu shu ju shi hun wei yi ti , de ta de ye jie dian zhong cun chu de shi shi ji de shu ju 。 you yu cu suo yin dui biao zhong de shu ju yi yi jin xing le pai xu , yin ci yong cu suo yin cha zhao shu ju hen kuai 。 dan you yu cu suo yin jiang biao de suo you shu ju wan quan chong xin pai lie le , ta suo xu yao de kong jian ye jiu te bie da , da gai xiang dang yu biao zhong shu ju suo zhan kong jian de 120% 。 biao de shu ju xing zhi neng yi yi zhong pai xu fang shi cun chu zai ci pan shang , suo yi yi ge biao zhi neng you yi ge cu suo yin 。 (2) fei cu suo yin ju you yu biao de shu ju wan quan fen li de jie gou , shi yong fei cu suo yin bu yong jiang wu li shu ju ye zhong de shu ju an lie pai xu 。 fei cu suo yin de ye jie dian zhong cun chu le zu cheng fei cu suo yin de guan jian zi de zhi he xing ding wei qi 。 xing ding wei qi de jie gou he cun chu nei rong qu jue yu shu ju de cun chu fang shi 。 ru guo shu ju shi yi cu suo yin fang shi cun chu de , ze xing ding wei qi zhong cun chu de shi cu suo yin de suo yin jian ; ru guo shu ju bu shi yi cu suo yin fang shi cun chu de , zhe zhong fang shi you cheng wei dui cun chu fang shi (Heap Structure), ze xing ding wei qi cun chu de shi zhi xiang shu ju xing de zhi zhen 。 fei cu suo yin jiang xing ding wei qi an guan jian zi de zhi yong yi ding de fang shi pai xu , zhe ge shun xu yu biao de xing zai shu ju ye zhong de pai xu shi bu pi pei de 。 you yu fei cu suo yin shi yong suo yin ye cun chu yin ci ta bi cu suo yin xu yao geng duo de cun chu kong jian qie jian suo xiao lv jiao di dan yi ge biao zhi neng jian yi ge cu suo yin , dang yong hu xu yao jian li duo ge suo yin shi jiu xu yao shi yong fei cu suo yin le 。 xiao jie :Clustered Index shi yu wu li shu ju hun zai yi qi bing dui wu li shu ju jin chong pai , jiu xiang shi yong pin yin cha zi dian ;Unclustered Index shi yu wu li shu ju wan quan fen li de , li yong e wai kong jian dui guan jian zi jin xing chong pai , jiu xiang shi yong bu shou cha zi dian 。 shu ju ku suo yin ying yong yi 、 suo yin de gai nian suo yin jiu shi jia kuai jian suo biao zhong shu ju de fang fa 。 shu ju ku de suo yin lei si yu shu ji de suo yin 。 zai shu ji zhong , suo yin yuan xu yong hu bu bi fan yue wan zheng ge shu jiu neng xun su di zhao dao suo xu yao de xin xi 。 zai shu ju ku zhong , suo yin ye yuan xu shu ju ku cheng xu xun su di zhao dao biao zhong de shu ju , er bu bi sao miao zheng ge shu ju ku 。 er 、 suo yin de te dian 1. suo yin ke yi jia kuai shu ju ku de jian suo su du 2. suo yin jiang di le shu ju ku cha ru 、 xiu gai 、 shan chu deng wei hu ren wu de su du 3. suo yin chuang jian zai biao shang , bu neng chuang jian zai shi tu shang 4. suo yin ji ke yi zhi jie chuang jian , ye ke yi jian jie chuang jian 5. ke yi zai you hua yin cang zhong , shi yong suo yin 6. shi yong cha xun chu li qi zhi xing SQL yu ju , zai yi ge biao shang , yi ci zhi neng shi yong yi ge suo yin 7. qi ta san 、 suo yin de you dian 1. chuang jian wei yi xing suo yin , bao zheng shu ju ku biao zhong mei yi xing shu ju de wei yi xing 2. da da jia kuai shu ju de jian suo su du , zhe ye shi chuang jian suo yin de zui zhu yao de yuan yin 3. jia su biao he biao zhi jian de lian jie , te bie shi zai shi xian shu ju de shen kao wan zheng xing fang mian te bie you yi yi 。 4. zai shi yong fen zu he pai xu zi ju jin xing shu ju jian suo shi , tong yang ke yi xian zhu jian shao cha xun zhong fen zu he pai xu de shi jian 。 5. tong guo shi yong suo yin , ke yi zai cha xun de guo cheng zhong shi yong you hua yin cang qi , ti gao xi tong de xing neng 。 si 、 suo yin de que dian 1. chuang jian suo yin he wei hu suo yin yao hao fei shi jian , zhe zhong shi jian sui zhe shu ju liang de zeng jia er zeng jia 2. suo yin xu yao zhan wu li kong jian , chu le shu ju biao zhan shu ju kong jian zhi wai , mei yi ge suo yin huan yao zhan yi ding de wu li kong jian , ru guo yao jian li ju cu suo yin , na me xu yao de kong jian jiu hui geng da 3. dang dui biao zhong de shu ju jin xing zeng jia 、 shan chu he xiu gai de shi hou , suo yin ye yao dong tai de wei hu , jiang di le shu ju de wei hu su du wu 、 suo yin fen lei 1. zhi jie chuang jian suo yin he jian jie chuang jian suo yin zhi jie chuang jian suo yin : CREATE INDEX mycolumn_index ON mytable (myclumn) jian jie chuang jian suo yin : ding yi zhu jian yue shu huo zhe wei yi xing jian yue shu , ke yi jian jie chuang jian suo yin 2. pu tong suo yin he wei yi xing suo yin pu tong suo yin :CREATE INDEX mycolumn_index ON mytable (myclumn) wei yi xing suo yin : bao zheng zai suo yin lie zhong de quan bu shu ju shi wei yi de , dui ju cu suo yin he fei ju cu suo yin dou ke yi shi yong CREATE UNIQUE COUSTERED INDEX myclumn_cindex ON mytable(mycolumn) 3. dan ge suo yin he fu he suo yin dan ge suo yin : ji fei fu he suo yin fu he suo yin : you jiao zu he suo yin , zai suo yin jian li yu ju zhong tong shi bao han duo ge zi duan ming , zui duo 16 ge zi duan CREATE INDEX name_index ON username(firstname,lastname) 4. ju cu suo yin he fei ju cu suo yin ( ju ji suo yin , qun ji suo yin ) ju cu suo yin : wu li suo yin , yu ji biao de wu li shun xu xiang tong , shu ju zhi de shun xu zong shi an zhao shun xu pai lie CREATE CLUSTERED INDEX mycolumn_cindex ON mytable(mycolumn) WITH ALLOW_DUP_ROW( yuan xu you chong fu ji lu de ju cu suo yin ) fei ju cu suo yin :CREATE UNCLUSTERED INDEX mycolumn_cindex ON mytable(mycolumn) liu 、 suo yin de shi yong 1. dang zi duan shu ju geng xin pin lv jiao di , cha xun shi yong pin lv jiao gao bing qie cun zai da liang chong fu zhi shi jian yi shi yong ju cu suo yin 2. jing chang tong shi cun qu duo lie , qie mei lie dou han you chong fu zhi ke kao lv jian li zu he suo yin 3. fu he suo yin de qian dao lie yi ding hao kong zhi hao , fou ze wu fa qi dao suo yin de xiao guo 。 ru guo cha xun shi qian dao lie bu zai cha xun tiao jian zhong ze gai fu he suo yin bu hui bei shi yong 。 qian dao lie yi ding shi shi yong zui pin fan de lie 4. duo biao cao zuo zai bei shi ji zhi xing qian , cha xun you hua qi hui gen ju lian jie tiao jian , lie chu ji zu ke neng de lian jie fang an bing cong zhong zhao chu xi tong kai xiao zui xiao de zui jia fang an 。 lian jie tiao jian yao chong fen kao lv dai you suo yin de biao 、 xing shu duo de biao ; nei wai biao de xuan ze ke you gong shi : wai ceng biao zhong de pi pei xing shu * nei ceng biao zhong mei yi ci cha zhao de ci shu que ding , cheng ji zui xiao wei zui jia fang an 5.where zi ju zhong dui lie de ren he cao zuo jie guo dou shi zai sql yun xing shi zhu lie ji suan de dao de , yin ci ta bu de bu jin xing biao sou suo , er mei you shi yong gai lie shang mian de suo yin ; ru guo zhe xie jie guo zai cha xun bian yi shi jiu neng de dao , na me jiu ke yi bei sql you hua qi you hua , shi yong suo yin , bi mian biao sou suo ( li :select * from record where substring(card_no,1,4)=’5378’ && select * from record where card_no like ’5378%’) ren he dui lie de cao zuo dou jiang dao zhi biao sao miao , ta bao kuo shu ju ku han shu 、 ji suan biao da shi deng deng , cha xun shi yao jin ke neng jiang cao zuo yi zhi deng hao you bian 6.where tiao jian zhong de ’in’ zai luo ji shang xiang dang yu ’or’, suo yi yu fa fen xi qi hui jiang in (’0′,’1′) zhuan hua wei column=’0′ or column=’1′ lai zhi xing 。 wo men qi wang ta hui gen ju mei ge or zi ju fen bie cha zhao , zai jiang jie guo xiang jia , zhe yang ke yi li yong column shang de suo yin ; dan shi ji shang ta que cai yong le "or ce lue ", ji xian qu chu man zu mei ge or zi ju de xing , cun ru lin shi shu ju ku de gong zuo biao zhong , zai jian li wei yi suo yin yi qu diao chong fu xing , zui hou cong zhe ge lin shi biao zhong ji suan jie guo 。 yin ci , shi ji guo cheng mei you li yong column shang suo yin , bing qie wan cheng shi jian huan yao shou tempdb shu ju ku xing neng de ying xiang 。in、or zi ju chang hui shi yong gong zuo biao , shi suo yin shi xiao ; ru guo bu chan sheng da liang chong fu zhi , ke yi kao lv ba zi ju chai kai ; chai kai de zi ju zhong ying gai bao han suo yin 7. yao shan yu shi yong cun chu guo cheng , ta shi sql bian de geng jia ling huo he gao xiao 。
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