--说明:创建数据库
create database USER(表名)
--说明:删除数据库
drop database USER(表名)
--说明:备份 sql server
--创建备份数据的 device
USE master
EXEX sp_addumpdevice 'disk','testBack','C:\mssql17backup\MyNwi'
nd_1.dat'
--开始备份
BACKUP DATABASE pibs TO testBack
--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
--说明:删除新表
drop table tabname
--说明:增加一个列
Alter table tabname add column col type
--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)
--说明:创建索引
create [unique] index idxname on tabname(col….)
--删除索引
drop index idxname
--说明:创建视图
create view viewname as select statement
--说明:删除视图
drop view viewname
--说明:几个最简单的基本的sql语句
条件:select * from table1 where (条件)
插入:insert into table1(field1,field2) values(value1,value2)
删除:delete from table1 where(条件)
跟新:update table1 set field1=value1 where (条件)
查找:select * from table1 where field1 like ’%value1%’ ---like
排序:select * from table1 order by field1,field2 [desc]或者[asc]
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
外连接:left (outer) join
本文转自12691034博客51CTO博客,原文链接http://blog.51cto.com/12701034/1929636如需转载请自行联系原作者
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