数据库常用语句

统计记录数Count()、DISTINCT

select COUNT(name)

from [DemoDB2008].[dbo].[tem]

use master

go

select COUNT( distinct name)

from [DemoDB2008].[dbo].[tem]

where name='jim'

统计字段不同值分别是什么

select distinct ss_id from dbo.Url_Base with(nolock)

查询的总量（无意义）

------------查询导进fff库的数量---------------

declare @c1 int,@c2 int,@sum int,@jt varchar(40),@wxj varchar(40)

set @jt='佳通'

set @wxj ='无限极'

select @c1= count(*) from

((select SN from ViewContentAndExt where SN like @jt+'%')

except

(select originalid from [12.111.0.1].Giti_VoC.dbo.article where originalid like @jt+'%')) as a

select @sum =COUNT(*) from ViewContentAndExt where SN like @jt+'%'

print 'meta库总计：'

print @sum

set @c2=@sum-@c1

print '传输成功的：'

print @c2

print '传输失败的：'

print @c1

SELECT COUNT(Url)

FROM [Url_Base] with(nolock)

SELECT C_Id

FROM [Url_Base] with(nolock)

GROUP BY

C_Id

SELECT SS_Id

FROM [Url_Base]

with(nolock) where C_Id = 3

GROUP BY

SS_Id

SELECT

Url,

COUNT( Url )

FROM

[Url_Base]

with(nolock) where (C_Id = 3 and SS_Id =17 )

GROUP BY

Url

HAVING

COUNT( Url) > 1

平均值计算函数AVG()

select AVG(age)

from [DemoDB2008].[dbo].[tem]

内容统计函数SUM()

select SUM(age)

from [DemoDB2008].[dbo].[tem]

修改

Update [Url_Base] set SN = 'Exchange_20111226_'+SN
where C_Id = 30

最大值MAX()和最小值计算MIN()

select MAX(age)

from [DemoDB2008].[dbo].[tem]

select MIN(age)

from [DemoDB2008].[dbo].[tem]

功能将字符串中的小写字母转换为大写字母。

--upper
select upper('he is a good person')

定时查询数据库

--例 等待1 小时2 分零3 秒后才执行SELECT 语句
waitfor delay '01:02:03'
select * from employee
--例 等到晚上11 点零8 分后才执行SELECT 语句
waitfor time '23:08:00'
select * from employee

创建临时表

declare @temp_table table

(

bookID VARCHAR(10) primary key,

book_price float default null,

bookName varchar(50)

)

insert into @temp_table values('1',50,'c#')

insert into @temp_table values('2',null ,'c')

select bookID AS '书的编号',isnull(book_price,0) as '书的价格'

from @temp_table

删除特定数据，除**之外的数据

delete from [MetaData].[dbo].[Url_Base] where SN not in('白沙','北京')

delete from 表名 where 字段名 <>'白沙' and 字段名<>'北京'

delete from [MataData_Office].[dbo].[Url_Base] where (SN >'00000000' and SN <'0000041100')

删除重复数据

/article/4965004.html

方法一：还是2000年的时候一位Oracle DBA叫罗敏发给技术部全体的（可惜原始邮件找不到了，要不然我当文物发给大家）：
delete from temp
where id not in (
select min(id)
from temp
group by column1,column2,...,columnn)
个人感觉这个方法思路比较清晰。不过效率相对来说不高。

方法二：赵贲在网络上搜出来的：
--删除相同城市下的相同行政区
delete a from area a where a.id>(select min(id) from area b where a.area_id=b.area_id and a.city_id=b.city_id)

方法三：使用sql 2005新增的row_number()功能和with关键字，我是从赵立东那里学来的。

print('删除PriceInfo表中重复的记录')
;WITH a AS (
SELECT ROW_NUMBER()OVER (PARTITION BY hotel_id,room_type_id,start_date,end_date
ORDER BY hotel_id,room_type_id,start_date,end_date) AS rn ,*
FROM hotel_price
)
delete from a WHERE a.rn>1

游标

declare cursor_c cursor

for select * from [DemoDB2008].[dbo].[tem]

open cursor_c fetch next from cursor_c

while @@fetch_status=0

begin

fetch next from cursor_c

end

close cursor_c

存储过程

USE DemoDB2008;//数据库名称

GO

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

create PROCEDURE dbo.sp_who//create 创建存储过程，alter 用于执行查询

AS

SELECT departmentName, [departmentRemark] FROM [DemoDB2008].[dbo].[Departments];//查询语句

GO

sp_who;//执行

execute sp_who; //执行

EXEC dbo.sp_who;GO//执行

DROP PROCEDURE dbo.sp_who;//删除存储过程

GO

带函数的存储过程

USE DemoDB2008;

GO

--IF OBJECT_ID ( 'dbo.usp', 'P' ) IS NOT NULL

-- DROP PROCEDURE dbo.usp;

--GO

alter PROCEDURE dbo.usp

@FirstName nvarchar(50), //定义两个变量

@LastName nvarchar(50)

AS

SET NOCOUNT ON;

SELECT [departmentID]

,[departmentName]

,[departmentRemark]

FROM [DemoDB2008].[dbo].[Departments]

WHERE [departmentID] = @FirstName and [departmentRemark]=@LastName ;

GO

新建查询语句

dbo.usp 5,df;//执行时必须两个变量

EXEC dbo.usp @LastName=df,@FirstName = 5;

新建存储过程和视图

检测各Job是否正常运行，为各Job提供依据

服务器名：222.85.28.1

库名：MetaData_1

表名：url_base url_ext url_content

存储过程名：P_CheckJob

创建存储过程：

USE [MetaData_Win7]

GO

/****** Object: StoredProcedure [dbo].[P_CheckJob] Script Date: 12/01/2011 15:11:37 ******/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

ALTER procedure [dbo].[P_CheckJob]

@SS_Id smallint,

@c nvarchar(20),

@day datetime

as

declare @count int,@sn varchar(50)

set @sn=@c+'_'+CONVERT(nvarchar(8),@day,112)+'%'

set @count=0

select @count=count(*) from url_base with(nolock) where SS_Id=@SS_Id and SN like @sn

print 'Base条数：'+cast(@count as varchar)

select @count=count(*) from Url_Ext with(nolock) where sn in (select SN from url_base with(nolock) where SS_Id=@SS_Id and SN like @sn)

print 'Ext条数：'+cast(@count as varchar)

select @count=count(*) from Url_Content with(nolock) where sn in (select SN from url_base with(nolock) where SS_Id=@SS_Id and SN like @sn)

print 'Content条数：'+cast(@count as varchar)

print '--------------'

示例：创建存储过程后执行下面语句

exec dbo.[P_CheckJob] 12,'**','20110914' -------------------soso

exec dbo.[P_CheckJob] 17,'**','20110914' ------------------qihoo

exec dbo.[P_CheckJob] 7,'**','20110914' ------------------ baidunews

exec dbo.[P_CheckJob] 2,'**','20110914' -----------------------baidu

exec dbo.[P_CheckJob] 20,'**','20110914' -----------------------google

结果示例：

Base条数：55

Ext条数：55

Content条数：55

--------------

Base条数：7

Ext条数：7

Content条数：7

--------------

Base条数：1758

Ext条数：1758

Content条数：1758

--------------

Base条数：4881

Ext条数：4881

Content条数：3391

--------------

Base条数：6153

Ext条数：6153

Content条数：6153

--------------

检测数据传输是否有问题（检测）

服务器名：2.85.28.1

库名：MetaData_1

视图：ViewContentAndExt

创建视图：

USE [MetaData_1]

GO

/****** Object: View [dbo].[ViewContentAndExt] Script Date: 12/01/2011 15:19:54 ******/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

create view [dbo].[ViewContentAndExt]

as

select Url_Ext.SN,Url_Ext.Page_Title,R_Id,Url,Author,Category_Value,Page_Desc,Page_DT,Page_Source,View_Count,Reply_Count,Same_Count,Page_Rank,Ext_1,Ext_2,Status_1,Status_2,Url_Content.Html_Source

from Url_Content with(nolock) inner join Url_Ext with(nolock) on Url_Content.SN=Url_Ext.SN

GO

创建存储过程：CREATE是创建， ALTER是执行

USE [MetaData_1]

GO

/****** Object: StoredProcedure [dbo].[procDayStatistics] Script Date: 12/01/2011 15:17:53 ******/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

ALTER proc [dbo].[procDayStatistics] (@C nvarchar(30), @start datetime,@end datetime)

as

declare @sql nvarchar(4000),@append nvarchar(200),@colname nvarchar(8)

set @sql='select '

while(@start<@end)

begin

set @colname=CONVERT(nvarchar(8),@start,112)

set @append=@C+'_'+ @colname+'%'

set @sql=@sql+'count(case when sn like '''+@append+''' then sn end) as '''+@colname+''','

select @start=DATEADD(day,1,@start)

end

set @colname=CONVERT(nvarchar(8),@start,112)

set @append=@C+'_'+ @colname+'%'

set @sql=@sql+'count(case when sn like '''+@append+''' then sn end) as '''+@colname+''' from ViewContentAndExt with(nolock)'

print @sql

exec(@sql)

存储过程创建完成后执行：

exec procDayStatistics '佳通','20110909','20110915'

exec [192.111.0.16].Giti_VoC.dbo.procDayStatistics '佳通','20110909','20110915'

exec dbo.procDayStatistics 'IE9','20111128','20111201'

exec IE9_VOC.dbo.procDayStatistics 'IE9','20111128','20111201'

结果示例：

复制表结构

1,右击数据表->编写表脚本为(S)->CREATE到(C)->剪贴板

2,右击目标数据库->新建查询(Q)，粘贴复制到的表结构->不要忘记修改数据库名称