SQL ¸½¼ÓÊý¾Ý¿âʱ³öÏÖ ÎÞ·¨´ò¿ªÎïÀíÎļþ´íÎó
SQL ¸½¼ÓÊý¾Ý¿âʱ³öÏÖ ÎÞ·¨´ò¿ªÎïÀíÎļþ´íÎó
´íÎóÐÅÏ¢:
Ö´ÐÐ Transact-SQL Óï¾ä»òÅú´¦Àíʱ·¢ÉúÁËÒì³£¡£ (Microsoft.SqlServer.ConnectionInfo)
------------------------------
ÎÞ·¨´ò¿ªÎïÀíÎļþ "D:\SqlDataBase\Test.mdf"¡£²Ù×÷ϵͳ´íÎó 5:"5(¾Ü¾ø·ÃÎÊ¡£)"¡£ (Microsoft SQL Server£¬´íÎó: 5120)
½â¾ö°ì·¨:
win7ÏÂÒÔ¹ÜÀíÔ±Éí·ÝÔËÐÐ SQL Êý¾Ý¿â ¼´¿É
»òÕß
¶Ï¿ªsaµÇ½ ÒÔwindows·½Ê½µÇ½
Ïà¹ØÎĵµ£º
with HostDevice as (----ÉÌ»§Ö÷»ú
select TerminalID ,Deviceid hostDeviceid ,Device.ModelID,Device.SN HostSN,Device.MerchantID,Device.InstallAddress,Device.SoftVersion
from Device
join model HostM on Device.ModelID=HostM.ModelID and HostM.Category in(0,3,4,5,6,8)
--where TerminalID is not null
) ......
ÅÅÃûº¯ÊýÊÇSQL Server2005мӵŦÄÜ¡£ÔÚSQL Server2005ÖÐÓÐÈçÏÂËĸöÅÅÃûº¯Êý£º
¡¡¡¡1. row_number
¡¡¡¡2. rank
¡¡¡¡3. dense_rank
¡¡¡¡4. ntile
¡¡¡¡Ò»¡¢row_number
¡¡¡¡row_numberº¯ÊýµÄÓÃ;ÊǷdz£¹ã·º£¬Õâ¸öº¯ÊýµÄ¹¦ÄÜÊÇΪ²éѯ³öÀ´µÄÿһÐмǼÉú³ÉÒ»¸öÐòºÅ¡£row_numberº¯ÊýµÄÓ÷¨ÈçÏÂÃæµÄSQLÓï¾äËùʾ£º
¡¡¡¡sel ......
Ò»¡¢Ç°ÑÔ
“ÈËÀàʧȥËÑË÷£¬ÊÀ½ç½«»áÔõÑù?”£¬Í¬Ñù£¬ºÜÄÑÏëÏóÒ»¸öÓµÓм«´óÐÅÏ¢Á¿µÄÐÐÒµÍøÕ¾ÃÅ»§Ã»ÓÐÕ¾ÄÚÈ«ÎÄËÑË÷½«»á³öÏÖÔõÑùµÄ¾ÖÃæ£¬ÍøÕ¾È«ÎļìË÷¶ÔÓÚÍÚ¾òÍøÕ¾ÐÅÏ¢ºÍÕûºÏÍøÕ¾×ÊÔ´µÄ¼ÛÖµÊDz»ÑÔ¶øÓ÷µÄ¡£ÎÒÃÇ¿´µ½£¬Í¨ÓÃÐ͵ÄËÑË÷ÒýÇæÒѾ³ÉΪÁË»¥ÁªÍøÊÀ½çµÄÃÅ»§£¬¶ø¶ÔÓÚÒ»¸öÐÅÏ¢Á¿¼«Æä·á¸»µÄÍøÕ¾¶øÑÔ£¬È«ÍøËÑË÷»òÐ ......
ÓÃsql*plus»òµÚÈý·½¿ÉÒÔÔËÐÐsqlÓï¾äµÄ³ÌÐòµÇ¼Êý¾Ý¿â£º
Ôö¼ÓÒ»¸öÁУº
ALTER TABLE ±íÃû ADD(ÁÐÃû Êý¾ÝÀàÐÍ);
È磺
ALTER TABLE emp ADD(weight NUMBER(38,0));
ÐÞ¸ÄÒ»¸öÁеÄÊý¾ÝÀàÐÍ(Ò»°ãÏÞÓÚÐ޸ij¤¶È£¬ÐÞ¸ÄΪһ¸ö²»Í¬ÀàÐÍʱÓÐÖî¶àÏÞÖÆ):
ALTER TABLE ±íÃû MODIFY(ÁÐÃû Êý¾ÝÀàÐÍ);
È磺
ALTER TABLE emp MODIFY(wei ......
ÔÚOracle10g֮ǰ£¬ÓÅ»¯SQLÊǸö±È½Ï·ÑÁ¦µÄ¼¼Êõ»î£¬²»Í£µÄ·ÖÎöÖ´Ðмƻ®£¬¼Óhint£¬·ÖÎöͳ¼ÆÐÅÏ¢µÈµÈ¡£ÔÚ10gÖУ¬OracleÍÆ³öÁË×Ô¼ºµÄSQLÓÅ»¯¸¨Öú¹¤¾ß: SQLÓÅ»¯Æ÷(SQL Tuning Advisor £ºSTA)£¬ËüÊÇеÄDBMS_SQLTUNE°ü¡£Ê¹ÓÃSTAÒ»¶¨Òª±£Ö¤ÓÅ»¯Æ÷ÊÇCBOģʽÏ¡£
Ö´ÐÐDBMS_SQLTUNE°ü½øÐÐsqlÓÅ»¯ÐèÒªÓÐadvisorµ ......