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

Ö´ÐÐSQLÈ¡PostgreSQLÊý¾Ý¿â»ò±í´óС

ÔÚPostgreSQL8.1.3ÉÏ¿ÉÒÔwork
1. È¡Êý¾Ý¿â´óС
SELECT pg_size_pretty(pg_database_size('somedatabase')) As fulldbsize
2. È¡±í´óС
SELECT pg_size_pretty(pg_total_relation_size('someschema.sometable')) As fulltblsize, pg_size_pretty(pg_relation_size('someschema.sometable')) As justthetblsize
Ô­Ìù£º
http://www.postgresonline.com/journal/index.php?/archives/110-Determining-size-of-database,-schema,-tables,-and-geometry.html


Ïà¹ØÎĵµ£º

Oracle:pl/sql Òì³£´¦Àí[ת]


pl/sql ÌṩÁËÇ¿´ó¶øÁé»îµÄÊÖ¶ÎÀ´²¶×½ºÍ´¦Àí³ÌÐò²úÉúµÄÒì³££¬´Ó¶øÊ¹ oracle µÄÓû§Ô¶ÀëһЩÁîÈË·³ÄÕµÄ bug ¡£
 
pl/sql Òì³£´¦ÀíµÄ¸ÅÄîºÍÊõÓï
 
ÔÚ oracle ÖÐËùÓеĴíÎó¶¼±»ÈÏΪÊDz»Ó¦¸Ã·¢ÉúµÄÒì³£¡£Ò»¸öÒì³£¿ÉÄÜÊÇÒÔÏ 3 ÖÖÇé¿öµÄÒ»ÖÖ£º
u       ÓÉϵͳ²úÉúµÄ´íÎó£¨& ......

SQL 2000 Óë SQL 2005 ¼æÈÝÎÊÌâ

 ×°ÁËSQL2000ºó°²×°SQL2005,ËäȻʹÓñðÃû¼ÓÒÔÇø±ðÁË£¬µ«·¢ÏÖ2005ÖÐûÓпɹ©·ÃÎʵÄÀàËÆÆóÒµ¹ÜÀíÆ÷£¬Ò»Ê±³å¶¯£¬Ð¶ÁË2000£¬ÍêÕû°²×°ÁË2005£¬·¢ÏÖ»¹ÊÇûÓÐÆóÒµ¹ÜÀíÆ÷£¬ËÑË÷¹ýºó²Å·¢ÏÖÐèÒª°²×°SQLServer2005_SSMSEE.msi£¨¼´SQLServerManagerStudioExpressEdition£©£¬ËüÌṩÁËÀàËÆÆóÒµ¹ÜÀíÆ÷µÄͼÐλ¯²Ù×÷½çÃæ¡£
×°ºÃºó£¬SQL ......

SQL ×óÍâÁ¬½Ó£¬ÓÒÍâÁ¬½Ó£¬È«Á¬½Ó£¬ÄÚÁ¬½Ó

 Áª½ÓÌõ¼þ¿ÉÔÚ   from   »ò   WHERE   ×Ó¾äÖÐÖ¸¶¨£¬½¨ÒéÔÚ   from   ×Ó¾äÖÐÖ¸¶¨Áª½ÓÌõ¼þ¡£WHERE   ºÍ   HAVING   ×Ó¾äÒ²¿ÉÒÔ°üº¬ËÑË÷Ìõ¼þ£¬ÒÔ½øÒ»²½É¸Ñ¡Áª½ÓÌõ¼þËùÑ¡µÄÐС£   
   
Áª½Ó¿É·ÖΪÒÔϼ¸Àࣺ      ......

SQL×¢Èë¹¥»÷µÄÔ­Àí¼°Æä·À·¶´ëÊ©

ת£ºhttp://blog.csdn.net/flyfranker/archive/2009/01/08/3733764.aspx
 ASP±à³ÌÃż÷ºÜµÍ£¬ÐÂÊÖºÜÈÝÒ×ÉÏ·¡£ÔÚÒ»¶Î²»³¤µÄʱ¼äÀÐÂÊÖÍùÍù¾ÍÒѾ­Äܹ»±à³ö¿´À´±È½ÏÍêÃÀµÄ¶¯Ì¬ÍøÕ¾£¬ÔÚ¹¦ÄÜÉÏ£¬ÀÏÊÖÄÜ×öµ½µÄ£¬ÐÂÊÖÒ²Äܹ»×öµ½¡£ÄÇôÐÂÊÖÓëÀÏÊÖ¾ÍÃ»Çø±ðÁËÂð£¿ÕâÀïÃæÇø±ð¿É¾Í´óÁË£¬Ö»²»¹ýÍâÐÐÈ˺ÜÄÑÒ»Ñ۾Ϳ´³öÀ´°ÕÁË¡£ÔÚ½ç ......

sql È¡·´

 update anketo1 set fb = substring('10',fb+1,1) WHERE id =5
ºóÀ´ÎÊÁËBM,BM˵ֱ½ÓÈ¡·´
update anketo1 set fb = ~ fb WHERE id =5
ÎÒ¸æËßÁËBMÓÃsubstringÒ²¿ÉÒÔ.
BM˵:"Õâ¼Ò»ïÀ÷º¦£¬ÕâÒ²ÄÜÏë³ö,ÕâÊôÓÚаÃÅÎ书."
×îºóÓÖÏëµ½ÓÃABSÈ¡¾ø¶ÔÖµÒ²¿ÉÒÔ
update anketo1 set fb = abs(fb-1)
ÎÒ¾õµÃ²»¹ÜÊÇʲôÎ书,ÄÜÖ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ