Home >Database >Mysql Tutorial >最基本的sql语句操作

最基本的sql语句操作

WBOY
WBOYOriginal
2016-06-07 16:21:42972browse

最基本的sql语句操作: 首先,简要介绍基础语句: 1、说明:创建数据库 CREATE DATABASE database-name 2、说明: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:m

   最基本的sql语句操作:

  首先,简要介绍基础语句:

  1、说明:创建数据库

  CREATE DATABASE database-name

  2、说明: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:mssql7backupMyNwind_1.dat’

  --- 开始 备份

  BACKUP DATABASE pubs TO testBack

  4、说明:创建新表

  create table tabname(col1 type1 [not null] [primary key],col2 type2 [not null],..)

  根据已有的表创建新表:

  A:create table tab_new like tab_old (使用旧表创建新表)

  B:create table tab_new as select col1,col2… from tab_old definition only

  5、说明:

  删除新表:drop table tabname

  6、说明:

  增加一个列:Alter table tabname add column col type

  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。

  7、说明:

  添加主键:Alter table tabname add primary key(col)

  说明:

  删除主键:Alter table tabname drop primary key(col)

  8、说明:

  创建索引:create [unique] index idxname on tabname(col….)

  删除索引:drop index idxname

  注:索引是不可更改的,想更改必须删除重新建。

  9、说明:

  创建视图:create view viewname as select statement

  删除视图:drop view viewname

  10、几个简单的基本的sql语句:

  选择:select * from table1 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 table1 where field1 like ’%value1%’ ---like的语法很精妙,查资料!

  排序:select * from table1 order by field1,field2 [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

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn