SQL语句
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asc按升序排列
j4j2c jW(F`.lI0desc按降序排列
0N U-]~0^;SM'?0下列语句部分是Mssql语句,不可以在access中使用。
#Ga9i%p!?7J5jQ0'J^3~:z{w[0SQL分类:51Testing软件测试网R a.Yhh
DDL—数据定义语言(CREATE,ALTER,DROP,DECLARE)
.H8`u Ys,p0DML—数据操纵语言(SELECT,DELETE,UPDATE,INSERT)51Testing软件测试网
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DCL—数据控制语言(GRANT,REVOKE,COMMIT,ROLLBACK)
3X&IHi(cpFU3h0首先,简要介绍基础语句:51Testing软件测试网'?e f![!Ug
1、说明:创建数据库51Testing软件测试网G1Po"r1UC
CREATE DATABASE database-name51Testing软件测试网z+_z SJ
2、说明:删除数据库
7^ V3\Yd6G q0drop database dbname
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F5s6pK03、说明:备份sql server51Testing软件测试网q9{{(hP9pU
---创建 备份数据的device51Testing软件测试网ar s\^0h
USE master51Testing软件测试网"j7p8f4n0z:~3F
EXEC sp_addumpdevice 'disk', 'testBack', 'c:\mssql7backup\MyNwind_1.dat'
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K1v,oTD?0---开始 备份
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N7t1Ub0BACKUP DATABASE pubs TO testBack51Testing软件测试网Z.V[5R{+n1E
4、说明:创建新表
[q2Dw9W,y7H'sbY0create table tabname(col1 type1 [not null] [primary key],col2 type2 [not null],..)51Testing软件测试网Vx7T0w:mr
根据已有的表创建新表:
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s1@+}-{nE0A:create table tab_new like tab_old (使用旧表创建新表)
;`h smV7L8vB#I0B:create table tab_new as select col1,col2… from tab_old definition only51Testing软件测试网!s:_:OQ6b5n@
5、说明:删除新表drop table tabname51Testing软件测试网2YfMze'G-u7v
6、说明:增加一个列
s7f~$pK0Alter table tabname add column col type51Testing软件测试网#U%}!h0k*OQa
注:列增加后将不能删除。DB2中列加上后数据类型也不能改变,唯一能改变的是增加varchar类型的长度。51Testing软件测试网NK&Z"\x5lb
7、说明:添加主键:Alter table tabname add primary key(col)51Testing软件测试网;uHC
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说明:删除主键:Alter table tabname drop primary key(col)
M?}6e2se08、说明:创建索引:create [unique] index idxname on tabname(col….)51Testing软件测试网d f4d+hb\v
删除索引:drop index idxname51Testing软件测试网"Vu8{I?
注:索引是不可更改的,想更改必须删除重新建。
3bA6APM/{K09、说明:创建视图:create view viewname as select statement
.?s/hTA V:L0删除视图:drop view viewname51Testing软件测试网-qW4G,V5B,M%N.C'gi
10、说明:几个简单的基本的sql语句51Testing软件测试网'S4\CCOQ
选择:select * from table1 where范围
u|&p*FE6oQ*s0插入:insert into table1(field1,field2) values(value1,value2)
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G-u0删除:delete from table1 where范围
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v0更新:update table1 set field1=value1 where范围
;{2C1Br~\.{X&OW&J0查找:select * from table1 where field1 like ’%value1%’ ---like的语法很精妙,查资料!
[~'nT`7Ss5C.[0排序:select * from table1 order by field1,field2 [desc]51Testing软件测试网OI\B
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总数:select count as totalcount from table1
m{ZZO)C+OylK0求和:select sum(field1) as sumvalue from table151Testing软件测试网un.XlYX
平均:select avg(field1) as avgvalue from table151Testing软件测试网e `no_
最大:select max(field1) as maxvalue from table1
u%Y-k7gt:L](h0最小:select min(field1) as minvalue from table151Testing软件测试网2U1eWo
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11、说明:几个高级查询运算词51Testing软件测试网w,s;t+m'w&W