Ò׽ؽØͼÈí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

sql²Ù×÷ÊÖ²á

ÏÂÁÐÓï¾ä²¿·ÖÊÇMssqlÓï¾ä£¬²»¿ÉÒÔÔÚaccessÖÐʹÓá£
SQL·ÖÀࣺ 
DDL—Êý¾Ý¶¨ÒåÓïÑÔ(CREATE£¬ALTER£¬DROP£¬DECLARE) 
DML—Êý¾Ý²Ù×ÝÓïÑÔ(SELECT£¬DELETE£¬UPDATE£¬INSERT) 
DCL—Êý¾Ý¿ØÖÆÓïÑÔ(GRANT£¬REVOKE£¬COMMIT£¬ROLLBACK)
Ê×ÏÈ,¼òÒª½éÉÜ»ù´¡Óï¾ä£º
1¡¢ËµÃ÷£º´´½¨Êý¾Ý¿â
CREATE DATABASE database-name 
2¡¢ËµÃ÷£ºÉ¾³ýÊý¾Ý¿â
drop database dbname
3¡¢ËµÃ÷£º±¸·Ýsql server
--- ´´½¨ ±¸·ÝÊý¾ÝµÄ device
USE master
EXEC sp_addumpdevice 'disk', 'testBack', 'c:\mssql7backup\MyNwind_1.dat'
--- ¿ªÊ¼ ±¸·Ý
BACKUP DATABASE pubs TO testBack 
4¡¢ËµÃ÷£º´´½¨Ð±í
create table tabname(col1 type1 [not null] [primary key],col2 type2 [not null],..)
¸ù¾ÝÒÑÓÐµÄ±í´´½¨ÐÂ±í£º 
A£ºcreate table tab_new like tab_old (ʹÓÃ¾É±í´´½¨Ð±í)
B£ºcreate table tab_new as select col1,col2… from tab_old definition only
5¡¢ËµÃ÷£ºÉ¾³ýбídrop table tabname 
6¡¢ËµÃ÷£ºÔö¼ÓÒ»¸öÁÐ
Alter table tabname add column col type
×¢£ºÁÐÔö¼Óºó½«²»ÄÜɾ³ý¡£DB2ÖÐÁмÓÉϺóÊý¾ÝÀàÐÍÒ²²»Äܸı䣬ΨһÄܸıäµÄÊÇÔö¼ÓvarcharÀàÐ͵ij¤¶È¡£
7¡¢ËµÃ÷£ºÌí¼ÓÖ÷¼ü£º Alter table tabname add primary key(col) 
˵Ã÷£ºÉ¾³ýÖ÷¼ü£º Alter table tabname drop primary key(col) 
8¡¢ËµÃ÷£º´´½¨Ë÷Òý£ºcreate [unique] index idxname on tabname(col….) 
ɾ³ýË÷Òý£ºdrop index idxname
×¢£ºË÷ÒýÊDz»¿É¸ü¸ÄµÄ£¬Ïë¸ü¸Ä±ØÐëɾ³ýÖØн¨¡£
9¡¢ËµÃ÷£º´´½¨ÊÓͼ£ºcreate view viewname as select statement 
ɾ³ýÊÓͼ£ºdrop view viewname
10¡¢ËµÃ÷£º¼¸¸ö¼òµ¥µÄ»ù±¾µÄsqlÓï¾ä
Ñ¡Ôñ£ºselect * from table1 where ·¶Î§
²åÈ룺insert into table1(field1,field2) values(value1,value2)
ɾ³ý£ºdelete from table1 where ·¶Î§
¸üУºupdate table1 set field1=value1 where ·¶Î§
²éÕÒ£ºselect * from table1 where field1 like ’%value1%’ ---likeµÄÓï·¨ºÜ¾«Ã²é×ÊÁÏ!
ÅÅÐò£ºselect * from table1 order by field1,field2 [desc]
×ÜÊý£ºselect count * as totalcount from table1
ÇóºÍ£ºselect sum(field1) as sumvalue from table1
ƽ¾ù£ºselect avg(field1) as avgvalue from table1
×î´ó


Ïà¹ØÎĵµ£º

ѹËõÊý¾Ý¿âºÍ±í¡¡(SQL SERVER 2008)

Database Level
- shrinkdb
- shrinkfile
 
SQL Server 2008
1) Right click database
2) Tasks
3) Shrink
4) Database or file
 
Table level
- compression
 
SQL Server 2008
1) Right click table
2) Storage
3) Manage Compression ......

sql Óï¾äʹÓÃ

SQLÓï¾ä(Ôö¡¢É¾¡¢¸Ä¡¢²é)
¡¡¡¡
¡¡¡¡Ò»¡¢Ôö£ºÓÐ4ÖÖ·½·¨
¡¡¡¡
¡¡¡¡1.ʹÓÃinsert²åÈëµ¥ÐÐÊý¾Ý£º
¡¡¡¡
¡¡¡¡Óï·¨£ºinsert [into] <±íÃû> [ÁÐÃû] values <ÁÐÖµ>
¡¡¡¡
¡¡¡¡Àý£ºinsert into Strdents (ÐÕÃû,ÐÔ±ð,³öÉúÈÕÆÚ) values ('¿ªÐÄÅóÅó','ÄÐ','1980/6/15')
¡¡¡¡
¡¡¡¡×¢Ò⣺into¿ÉÒÔÊ¡ÂÔ£»ÁÐÃûÁÐÖµÓöºº ......

MySQLÖÐÓÃsqlÓï¾ä²åÈëʱÆÚ

mysql> create table testdate(
         -> id int not null auto_increment primary key,
         -> time date);
Query OK, 0 rows affected (0.30 sec)
mysql> insert into testdate(time) values('2010-4-23');
Q ......

SQL Óï¾ä ¼ò½é

×î½üÁ½ÌìÒ»Ö±ÔÚÕÛÌÚSQLÓï¾ä£¬Ã»°ì·¨£¬Ð´Êý¾Ý¿âµÄÐֵܸøÁËÁ½¸öÀý×ӾͲ»ÔÙ¹ÜÁË£¬¶øÇÒ×î½üÇë¼ÙÁË¡£½ñÌì¼Ó°à»¹ÊÇÕÛÌÚÕâôһ¸öÓï¾ä£¬×ÜÊDz»¶Ô£¬ÇëÀÏ´ó¿´ÁË¿´»¹ÊÇû¿´³öÃŵÀÀ´£¬ ÔÚSQLite Expert Professional ÀïÃæдµÄÓï¾ä¶¼¿ÉÒÔÖ´Ðгɹ¦£¬µ«ÊÇÔÚAndroidµÄ¹¤³ÌÀïÃæÔõôÕÛÌھͲ»¶Ô¡£ ÓôÃÆ°¡£¬½ñÌì¼Ó°àËãÊÇ°×¼ÓÁË¡£
ΪÁ˲éÕÒºÍÑ§Ï ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØͼ | ¸ÓICP±¸09004571ºÅ