SQL基础

标签：database   value   count   范围   prim   column   nbsp   into   选择   

1.创建数据库：create database 数据库名（database-name）

2.删除数据库：drop database  dbname

3.说明：备份 sql server

--创建 备份数据的 device

  use master exec sp_addumpdevice ‘disk‘,‘testBack‘,‘c:\mssql7backup\MyNwind_1.dat‘

--开始 备份

BACKUP DATABASE pubs TO testBack

4.说明：创建新表

create table tabname(coll typel [not null] [primary key],col2 type2 [not null],...)

5.删除新表

drop table tabname

6.增加一个列

alter table tabname add column col type

7.添加/删除主键

alter table tabname add/drop primary key(col)

8.创建视图

create view viewname as select statement

删除视图

drop view viewname

9.简单的sql语句

选择：select * from table where 范围

插入：insert into table1(field1,field2) values(value1,value2)

删除：delete from table1 where 范围

更新：update table1 set field1=value1 where 范围

查找：select * from table where field1 like ‘%value1%‘ 

排序：select * from table1 order by field1,field2    //默认排序desc

总数：select count as totalcount from table1

求和：select sum(field1) as sumvalue from table1

平均：select avg(field1) as avgvalue from table1

最大：select max(field1) as maxvalue from table1

最小：select min(field1) as minvalue from table1

SQL基础

标签：database   value   count   范围   prim   column   nbsp   into   选择   

原文地址：http://www.cnblogs.com/freehome-see/p/6657609.html