1、创建数据库
Create database database_name;
2、删除数据库
Drop database db_name;
3、sql server 备份
backup database db_name to disk=';d:dbn.aa';//指定需要备份数据库的路径和文件名；
4、sql server恢复
use master
restore database dbname from disk=';d:dbn.aa' with replace;
---kill掉数据库的某个连接
CREATE PROC KillSpid(@DBName varchar)
AS
BEGIN
DECLARE @SQL varchar
DECLARE @SPID int
SET @SQL='DECLARE CurrentID CURSOR FOR
SELECT spid FROM sysprocesses WHERE dbid=db_id('''+@DBName+''') '
FETCH NEXT FROM CurrentID INTO @SPID
WHILE @@FETCH_STATUS <>-1
BEGIN
exec('KILL '+@SPID)
FETCH NEXT FROM CurrentID INTO @SPID
END
CLOSE CurrentID
DEALLOCATE CurrentID
END
5、创建新表
Create table tab_new like tab_old(用旧表创建新表)
Create table tab_new as select col1,col2...from tab_old definition only;
6、删除新表
Drop table table_name;
7、新增列
Alter table tab_name add column_name varchar(30);
8、修改列类型
Alter table tab_name alter old_column_name new_column_name varchar(30);
9、修改列名称
exec sp_rename 'tablename.column1','column2'//把1列名修改为列名2；
10、删除列
Alter table table_name drop column_name;
11、添加主键
Alter table table_name add primary key(id);//id添加为主键；
12、删除主键
Alter table table_name drop primary key(id)
13、创建索引
Alter table table_name add index index_name (column_list) ||
Create [unique] index index_name on table_name(column_list)
14、删除索引
Drop index index_name;
15、创建视图
Create view viewname as select statement(条件)
例如：Create view view_name as select id=1 from user;
16、删除视图
Drop view view_name;
17。查询语句：
>>select * from table where range（范围）;
>>insert into table1(field1,field2)values(value1,value2);插入值
>>delete from table1 where range(范围);删除
>>update table1 set field1=value1 where range（范围);更新值
>>select * from table1 where field like '%value1%'；//Like主要用于模糊查询，查询field字段中包含value1的内容；
select * from table where field like 'li*'//查询表中field字段中以li开头的内容；
select * from table where field like '%[0-9]%'查询表中field中包含有数字的内容；
select * from table where field like '%[!0-9]%'查询表中field中不包含有数字的内容；
select * from table where field like '%[a-z]%'查询表中field中包含有字母的内容；
>>select * from table1 order by field1 desc;//表中的field字段从大到小排序；
select * from table1 order by field1 asc;//表中的field字段从小到大排序；
>>select count as totalcount from table1//总数；
>>select sum(field1) as sumvalue from table//求和；
>>select avg(field1)as avgvalue from table//求平均数
>>select max(field1) as maxvalue from table//求最大值
>>select min(field1) as minvalue from table//求最小值
18、联合查询
>>select column_name(s) from table_name1 union select column_name(s) from table_name2；//union 查询结果是去重的；
>>select column_name(s) from table_name1 union all select column_name(s) from table_name2;//union all 查询全部的结果，未去除重复；
19、except 从左查询中返回右查询没有找到的所有非重复值；返回两个结果集的差
>>select * from table1 except select * from table2;
20、intersect返回两个结果集的交集
>>select * from table1 intersect select * from table2;
21、使用外连接
>>left outer join(左外联接，左连接)
select * from table1 left join table2 on table1.id=table.id;
//结果集包括left join中指定的左表的所有行，而不仅仅是联接所匹配的行，如果左表的某行在右边没有匹配行，则在相关联的结果集行中右表的所有选择列表列均为空值（null）；
select A.name,A.age,B.name,B.score from table_A A left join table_B B on A.name=B.name;//(table_A/table_B是表名，A,B是别名)；
select A.name,A.age,B.name,B.score from table_A A left outer join table_B B on A.name=B.name;
>>right outer join(右外联接)//返回右表中的所有行，如果右表的某行在左表中没有匹配行，则将为左表返回空值；
select A.name,A.age,B.name,B.score from table_A A right join table_B B on A.name=B.name;
select A.name,A.age,B.name,B.score from table_A A left outer join table_B B on A.name=B.name;
>>full outer join(完整外联接)
select A.name,A.age,B.name,B.score from table_A A full join table_B B on A.name=B.name;
select A.name,A.age,B.name,B.score from table_A A full outer join table_B B on A.name=B.name;
>>Cross join 交叉联接
select A.name,A.age,B.name,B.score from table_A A cross join table_B B;
>>自联接
select A.name,A.age,B.name,B.score from table_A A,table_B,B where A.name=B.name+1
22、inner join 内联接
select A.name,A.age,B.name,B.score from table_A A inner join table_B B on A.name=B.name;
select A.name,A.age,B.name,B.score from table_A A join table_B B on A.name=B.name;
存储过程：
杀掉连接的用户
CREATE PROCEDURE dbo.killrubbishprocess AS
DECLARE @spidnum int
DECLARE rubbish_CURSOR CURSOR FOR
select spid
from master.dbo.sysprocesses
where spid > 10 and spid <= 32767 and status='sleeping' and loginame='sa'
order by spid
OPEN rubbish_CURSOR
FETCH NEXT FROM rubbish_CURSOR
INTO @spidnum
select s_kill = "kill " + cast(@spidnum as char(5))
WHILE @@FETCH_STATUS=0
BEGIN
EXEC (s_kill)
FETCH NEXT FROM rubbish_CURSOR
INTO @spidnum
END
CLOSE rubbish_CURSOR
DEALLOCATE rubbish_CURSOR
GO