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SERVER常用语法汇总,常用语法

3.6、如何取得一个数据表的所有列名

先从SYSTEMOBJECT系统表中取得数据表的SYSTEMID,然后再SYSCOLUMN表中取得该数据表的所有列名。

SQL语句如下:

图片 1

declare @objid int,@objname char(40)
set @objname = 'tablename'


select @objid = id from sysobjects where id = object_id(@objname)
select 'Column_name' = name from syscolumns where id = @objid order by colid

图片 2

或 

SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME ='users'

 

3.12、获取表结构[把 'sysobjects' 替换 成 'tablename' 即可]

SELECT CASE IsNull(I.name, '')
When '' Then ''
Else '*'
End as IsPK,
Object_Name(A.id) as t_name,
A.name as c_name,
IsNull(SubString(M.text, 1, 254), '') as pbc_init,
T.name as F_DataType,
CASE IsNull(TYPEPROPERTY(T.name, 'Scale'), '')
WHEN '' Then Cast(A.prec as varchar)
ELSE Cast(A.prec as varchar)   ','   Cast(A.scale as varchar)
END as F_Scale,
A.isnullable as F_isNullAble
FROM Syscolumns as A
JOIN Systypes as T
ON (A.xType = T.xUserType AND A.Id = Object_id('sysobjects') )
LEFT JOIN ( SysIndexes as I
JOIN Syscolumns as A1
ON ( I.id = A1.id and A1.id = object_id('sysobjects') and (I.status & 0x800) = 0x800 AND A1.colid <= I.keycnt) )
ON ( A.id = I.id AND A.name = index_col('sysobjects', I.indid, A1.colid) )
LEFT JOIN SysComments as M
ON ( M.id = A.cdefault and ObjectProperty(A.cdefault, 'IsConstraint') = 1 )
ORDER BY A.Colid ASC

2.10、说明:基本sql语句选择

查询:select * from table1 where 范围
插入:insert into table1(field1,field2) s(1,2)
删除:delete from table1 where 范围
更新:update table1 set field1=1 where 范围
查找:select * from table1 where field1 like ’%1%’ ---like的语法
排序:select * from table1 order by field1,field2 [desc]
总数:select count * as totalcount from table1
求和:select sum(field1) as sum from table1
平均:select avg(field1) as avg from table1
最大:select max(field1) as max from table1
最小:select min(field1) as min from table1

4.4、 导出文本文件

图片 3

EXEC master..xp_cmdshell 'bcp "dbname..tablename" out c:DT.txt -c -Sservername -Usa -Ppassword'
或
EXEC master..xp_cmdshell 'bcp "Select * from dbname..tablename" queryout c:DT.txt -c -Sservername -Usa -Ppassword'

导出到TXT文本,用逗号分开
exec master..xp_cmdshell 'bcp "库名..表名" out "d:tt.txt" -c -t ,-U sa -P password'


BULK INSERT 库名..表名
FROM 'c:test.txt'
WITH (
FIELDTERMINATOR = ';',
ROWTERMINATOR = 'n'
)

图片 4

 

 补充:

图片 5

--/* dBase IV文件
select * from
OPENROWSET('MICROSOFT.JET.OLEDB.4.0'
,'dBase IV;HDR=NO;IMEX=2;DATABASE=C:','select * from [客户资料4.dbf]')
--*/

--/* dBase III文件
select * from
OPENROWSET('MICROSOFT.JET.OLEDB.4.0'
,'dBase III;HDR=NO;IMEX=2;DATABASE=C:','select * from [客户资料3.dbf]')
--*/

--/* FoxPro 数据库
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;SourceType=DBF;SourceDB=c:',
'select * from [aa.DBF]')
--*/

图片 6

3.6、如何取得一个数据表的所有列名

先从SYSTEMOBJECT系统表中取得数据表的SYSTEMID,然后再SYSCOLUMN表中取得该数据表的所有列名。

SQL语句如下:

declare @objid int,@objname char(40)
set @objname = 'tablename'


select @objid = id from sysobjects where id = object_id(@objname)
select 'Column_name' = name from syscolumns where id = @objid order by colid

或 

SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME ='users'

 

3.9、如何在数据库里找到含有相同字段的表

a. 查已知列名的情况

SELECT b.name as TableName,a.name as columnname
From syscolumns a INNER JOIN sysobjects b
ON a.id=b.id
AND b.type='U'
AND a.name='字段名'

 

b.未知列名查所有在不同表出现过的列名

Select o.name As tablename,s1.name As columnname
From syscolumns s1, sysobjects o
Where s1.id = o.id
And o.type = 'U'
And Exists (
Select 1 From syscolumns s2
Where s1.name = s2.name
And s1.id <> s2.id
)

 

二、基础语句

4.10.2、导入调用示例

----导入单个表

exec file2table 'zj','','','xzkh_sa..地区资料','c:zj.txt',0

 

----导入整个数据库

exec file2table 'zj','','','xzkh_sa','C:docman',0 

一、SQL分类

DDL—数据定义语言(CREATE,ALTER,DROP,DECLARE)

DML—数据操纵语言(SELECT,DELETE,UPDATE,INSERT)

DCL—数据控制语言(GRANT,REVOKE,COMMIT,ROLLBACK)

 

4.6、 导出到DBF 文件

如果要导出数据到已经生成结构(即现存的)FOXPRO表中,可以直接用下面的SQL语句

insert into openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;SourceType=DBF;SourceDB=c:',
'select * from [aa.DBF]')

select * from 表

 

说明:

SourceDB=c: 指定foxpro表所在的文件夹

aa.DBF 指定foxpro表的文件名.

 

4.8、导入Access

insert into B表 selet * from openrowset('Microsoft.Jet.OLEDB.4.0',
'x:A.mdb';'admin';'',A表)

4.10.1、导出调用示例

----导出单个表

exec file2table 'zj','','','xzkh_sa..地区资料','c:zj.txt',1

 

----导出整个数据库

exec file2table 'zj','','','xzkh_sa','C:docman',1 

2.4、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

4.10、导整个数据库

用bcp实现的存储过程

实现数据导入/导出的存储过程

根据不同的参数,可以实现导入/导出整个数据库/单个表

调用示例:

四、(MS SQL Server)SQL语句导入导出大全

3.9、如何在数据库里找到含有相同字段的表

a. 查已知列名的情况

SELECT b.name as TableName,a.name as columnname
From syscolumns a INNER JOIN sysobjects b
ON a.id=b.id
AND b.type='U'
AND a.name='字段名'

 

b.未知列名查所有在不同表出现过的列名

图片 7

Select o.name As tablename,s1.name As columnname
From syscolumns s1, sysobjects o
Where s1.id = o.id
And o.type = 'U'
And Exists (
Select 1 From syscolumns s2
Where s1.name = s2.name
And s1.id <> s2.id
)

图片 8

 

4.11、Excel导到Txt

想用

select * into opendatasource(...) from opendatasource(...)

实现将一个Excel文件内容导入到一个文本文件

 

假设Excel中有两列,第一列为姓名,第二列为很行帐号(16位)

且银行帐号导出到文本文件后分两部分,前8位和后8位分开。

 

如果要用你上面的语句插入的话,文本文件必须存在,而且有一行:姓名,银行账号1,银行账号2

然后就可以用下面的语句进行插入

注意文件名和目录根据你的实际情况进行修改.

insert into
opendatasource('MICROSOFT.JET.OLEDB.4.0'
,'Text;HDR=Yes;DATABASE=C:'
)...[aa#txt]
--,aa#txt)
--*/

select 姓名,银行账号1=left(银行账号,8),银行账号2=right(银行账号,8)
from
opendatasource('MICROSOFT.JET.OLEDB.4.0'
,'Excel 5.0;HDR=YES;IMEX=2;DATABASE=c:a.xls'
--,Sheet1$)
)...[Sheet1$]

 

 

如果你想直接插入并生成文本文件,就要用bcp

declare @sql varchar(8000),@tbname varchar(50) 

首先将excel表内容导入到一个全局临时表

select @tbname='[##temp' cast(newid() as varchar(40)) ']'
,@sql='select 姓名,银行账号1=left(银行账号,8),银行账号2=right(银行账号,8)
into ' @tbname ' from
opendatasource(''MICROSOFT.JET.OLEDB.4.0''
,''Excel 5.0;HDR=YES;IMEX=2;DATABASE=c:a.xls''
)...[Sheet1$]'

exec(@sql)

然后用bcp从全局临时表导出到文本文件

set @sql='bcp "' @tbname '" out "c:aa.txt" /S"(local)" /P"" /c'
exec master..xp_cmdshell @sql

删除临时表

exec('drop table ' @tbname) 

4.4、 导出文本文件

EXEC master..xp_cmdshell 'bcp "dbname..tablename" out c:DT.txt -c -Sservername -Usa -Ppassword'
或
EXEC master..xp_cmdshell 'bcp "Select * from dbname..tablename" queryout c:DT.txt -c -Sservername -Usa -Ppassword'

导出到TXT文本,用逗号分开
exec master..xp_cmdshell 'bcp "库名..表名" out "d:tt.txt" -c -t ,-U sa -P password'


BULK INSERT 库名..表名
FROM 'c:test.txt'
WITH (
FIELDTERMINATOR = ';',
ROWTERMINATOR = 'n'
)

 

 补充:

--/* dBase IV文件
select * from
OPENROWSET('MICROSOFT.JET.OLEDB.4.0'
,'dBase IV;HDR=NO;IMEX=2;DATABASE=C:','select * from [客户资料4.dbf]')
--*/

--/* dBase III文件
select * from
OPENROWSET('MICROSOFT.JET.OLEDB.4.0'
,'dBase III;HDR=NO;IMEX=2;DATABASE=C:','select * from [客户资料3.dbf]')
--*/

--/* FoxPro 数据库
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;SourceType=DBF;SourceDB=c:',
'select * from [aa.DBF]')
--*/

4.2、 导入Excel

图片 9

SELECT *
FROM OpenDataSource( 'Microsoft.Jet.OLEDB.4.0',
'Data Source="c:test.xls";User ID=Admin;Password=;Extended properties=Excel 5.0')...xactions

SELECT cast(cast(科目编号 as numeric(10,2)) as nvarchar(255)) ' ' 转换后的别名
FROM OpenDataSource( 'Microsoft.Jet.OLEDB.4.0',
'Data Source="c:test.xls";User ID=Admin;Password=;Extended properties=Excel 5.0')...xactions

select * from OPENROWSET('MICROSOFT.JET.OLEDB.4.0','Excel 5.0;HDR=YES;DATABASE=c:Book1.xls',Sheet1$)

HDR=YES;Excel第一行当成标题行
HDR=NO;第一行不当成标题行

图片 10

四、(MS SQL Server)SQL语句导入导出大全

3.14、快速获取表test的记录总数[对大容量表非常有效]

快速获取表test的记录总数:

select rows from sysindexes where id = object_id('test') and indid in (0,1)

update 2 set KHXH=(ID 1)2 2行递增编号
update [23] set id1 = 'No.' right('00000000' id,6) where id not like 'No%' //递增
update [23] set id1= 'No.' right('00000000' replace(id1,'No.',''),6) //补位递增
delete from [1] where (id%2)=1


奇数
替换表名字段
update [1] set domurl = replace(domurl,'Upload/Imgswf/','Upload/Photo/') where domurl like '%Upload/Imgswf/%'

截位
SELECT LEFT(表名, 5)

截位
SELECT LEFT(表名, 5)

2.12、说明:使用外连接

A、left outer join: 左外连接(左连接):结果集几包括连接表的匹配行,也包括左连接表的所有行。

SQL: select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c

B:right outer join: 右外连接(右连接):结果集既包括连接表的匹配连接行,也包括右连接表的所有行。

C:full outer join: 全外连接:不仅包括符号连接表的匹配行,还包括两个连接表中的所有记录。

 

2.3、说明:备份sql server

--- 创建 备份
USE master
EXEC sp_addumpdevice 'disk', 'testBack', 'c:mssql7backupMyNwind_1.dat'
--- 开始 备份
BACKUP DATABASE pubs TO testBack

3.3、求删除重复记录的sql语句

怎样把具有相同字段的记录删除,只留下一条。

例如,表test里有id,name字段

如果有name相同的记录 只留下一条,其余的删除。

name的内容不定,相同的记录数不定。

==============================

一个完整的解决方案:

1)将重复的记录记入temp1表:
select [标志字段id],count(*) into temp1 from [表名]
group by [标志字段id]
having count(*)>1


2)将不重复的记录记入temp1表:
insert temp1 select [标志字段id],count(*) from [表名] group by [标志字段id] having count(*)=1

3)作一个包含所有不重复记录的表:
select * into temp2 from [表名] where 标志字段id in(select 标志字段id from temp1)

4)删除重复表:
delete [表名]

5)恢复表:
insert [表名] select * from temp2

6)删除临时表:
drop table temp1
drop table temp2

4.8、导入Access

insert into B表 selet * from openrowset('Microsoft.Jet.OLEDB.4.0',
'x:A.mdb';'admin';'',A表)

3.5、行列转换--合并

有表A,

id pid
1 1
1 2
1 3
2 1
2 2
3 1

如何化成表B:

id pid
1 1,2,3
2 1,2
3 1

创建一个合并的函数

create function fmerg(@id int)
returns varchar(8000)
as
begin
declare @str varchar(8000)
set @str=''

select @str=@str ',' cast(pid as varchar) from 表A where id=@id
set @str=right(@str,len(@str)-1)

return(@str)
End
go

调用自定义函数得到结果

select distinct id,dbo.fmerg(id) from 表A

 

2.3、说明:备份sql server

--- 创建 备份
USE master
EXEC sp_addumpdevice 'disk', 'testBack', 'c:mssql7backupMyNwind_1.dat'
--- 开始 备份
BACKUP DATABASE pubs TO testBack

回到目录

 

3.1、如何删除一个表中重复的记录?

create table a_dist(id int,name varchar(20))

insert into a_dist values(1,'abc')
insert into a_dist values(1,'abc')
insert into a_dist values(1,'abc')
insert into a_dist values(1,'abc')

exec up_distinct 'a_dist','id'

select * from a_dist

 存储过程如下:

图片 11图片 12

 1 create procedure up_distinct(@t_name varchar(30),@f_key varchar(30))
 2 --f_key表示是分组字段﹐即主键字段
 3 
 4 as
 5 begin
 6 declare @max integer,@id varchar(30) ,@sql varchar(7999) ,@type integer
 7 select @sql = 'declare cur_rows cursor for select ' @f_key ' ,count(*) from '  @t_name  ' group by '  @f_key  ' having count(*) > 1'
 8 exec(@sql)
 9 
10 open cur_rows
11 fetch cur_rows into @id,@max
12 
13 while @@fetch_status=0
14 begin
15 select @max = @max -1
16 set rowcount @max
17 select @type = xtype from syscolumns where id=object_id(@t_name) and name=@f_key
18 if @type=56
19 select @sql = 'delete from ' @t_name ' where '   @f_key ' = '  @id
20 if @type=167
21 select @sql = 'delete from ' @t_name ' where '   @f_key ' = ' ''''  @id  ''''
22 exec(@sql)
23 
24 fetch cur_rows into @id,@max
25 end
26 
27 close cur_rows
28 deallocate cur_rows
29 
30 set rowcount 0
31 end
32 
33 select * from systypes
34 select * from syscolumns where id = object_id('a_dist')

View Code

3.13、提取数据库内所有表的字段详细说明的SQL语句

图片 13

SELECT
(case when a.colorder=1 then d.name else '' end) N'表名',
a.colorder N'字段序号',
a.name N'字段名',
(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else ''
end) N'标识',
(case when (SELECT count(*)
FROM sysobjects
WHERE (name in
(SELECT name
FROM sysindexes
WHERE (id = a.id) AND (indid in
(SELECT indid
FROM sysindexkeys
WHERE (id = a.id) AND (colid in
(SELECT colid
FROM syscolumns
WHERE (id = a.id) AND (name = a.name))))))) AND
(xtype = 'PK'))>0 then '√' else '' end) N'主键',
b.name N'类型',
a.length N'占用字节数',
COLUMNPROPERTY(a.id,a.name,'PRECISION') as N'长度',
isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as N'小数位数',
(case when a.isnullable=1 then '√'else '' end) N'允许空',
isnull(e.text,'') N'默认值',
isnull(g.[value],'') AS N'字段说明'
FROM syscolumns a
left join systypes b
on a.xtype=b.xusertype
inner join sysobjects d
on a.id=d.id and d.xtype='U' and d.name<>'dtproperties'
left join syscomments e
on a.cdefault=e.id
left join sysproperties g
on a.id=g.id AND a.colid = g.smallid
order by object_name(a.id),a.colorder

图片 14

4.4、 导出文本文件

EXEC master..xp_cmdshell 'bcp "dbname..tablename" out c:DT.txt -c -Sservername -Usa -Ppassword'
或
EXEC master..xp_cmdshell 'bcp "Select * from dbname..tablename" queryout c:DT.txt -c -Sservername -Usa -Ppassword'

导出到TXT文本,用逗号分开
exec master..xp_cmdshell 'bcp "库名..表名" out "d:tt.txt" -c -t ,-U sa -P password'


BULK INSERT 库名..表名
FROM 'c:test.txt'
WITH (
FIELDTERMINATOR = ';',
ROWTERMINATOR = 'n'
)

 

 补充:

--/* dBase IV文件
select * from
OPENROWSET('MICROSOFT.JET.OLEDB.4.0'
,'dBase IV;HDR=NO;IMEX=2;DATABASE=C:','select * from [客户资料4.dbf]')
--*/

--/* dBase III文件
select * from
OPENROWSET('MICROSOFT.JET.OLEDB.4.0'
,'dBase III;HDR=NO;IMEX=2;DATABASE=C:','select * from [客户资料3.dbf]')
--*/

--/* FoxPro 数据库
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;SourceType=DBF;SourceDB=c:',
'select * from [aa.DBF]')
--*/

2.11、说明:高级查询运算

A: UNION 运算符

UNION 运算符通过组合其他两个结果表(例如 TABLE1 和 TABLE2)并消去表中任何重复行而派生出一个结果表。

当 ALL 随 UNION 一起使用时(即 UNION ALL),不消除重复行。

两种情况下,派生表的每一行不是来自 TABLE1 就是来自 TABLE2。

B: EXCEPT 运算符

EXCEPT 运算符通过包括所有在 TABLE1 中但不在 TABLE2 中的行并消除所有重复行而派生出一个结果表。

当 ALL 随 EXCEPT 一起使用时 (EXCEPT ALL),不消除重复行。

C: INTERSECT 运算符

INTERSECT 运算符通过只包括 TABLE1 和 TABLE2 中都有的行并消除所有重复行而派生出一个结果表。

当 ALL 随 INTERSECT 一起使用时 (INTERSECT ALL),不消除重复行。

注:使用运算词的几个查询结果行必须是一致的。

3.1、如何删除一个表中重复的记录?

图片 15

create table a_dist(id int,name varchar(20))

insert into a_dist values(1,'abc')
insert into a_dist values(1,'abc')
insert into a_dist values(1,'abc')
insert into a_dist values(1,'abc')

exec up_distinct 'a_dist','id'

select * from a_dist

图片 16

 存储过程如下:

图片 17

图片 18

 1 create procedure up_distinct(@t_name varchar(30),@f_key varchar(30))
 2 --f_key表示是分组字段﹐即主键字段
 3 
 4 as
 5 begin
 6 declare @max integer,@id varchar(30) ,@sql varchar(7999) ,@type integer
 7 select @sql = 'declare cur_rows cursor for select ' @f_key ' ,count(*) from '  @t_name  ' group by '  @f_key  ' having count(*) > 1'
 8 exec(@sql)
 9 
10 open cur_rows
11 fetch cur_rows into @id,@max
12 
13 while @@fetch_status=0
14 begin
15 select @max = @max -1
16 set rowcount @max
17 select @type = xtype from syscolumns where id=object_id(@t_name) and name=@f_key
18 if @type=56
19 select @sql = 'delete from ' @t_name ' where '   @f_key ' = '  @id
20 if @type=167
21 select @sql = 'delete from ' @t_name ' where '   @f_key ' = ' ''''  @id  ''''
22 exec(@sql)
23 
24 fetch cur_rows into @id,@max
25 end
26 
27 close cur_rows
28 deallocate cur_rows
29 
30 set rowcount 0
31 end
32 
33 select * from systypes
34 select * from syscolumns where id = object_id('a_dist')

图片 19

二、基础语句

 

图片 20图片 21

 1 if exists(select 1 from sysobjects where name='File2Table' and objectproperty(id,'IsProcedure')=1)
 2 drop procedure File2Table
 3 go
 4 create procedure File2Table
 5 @servername varchar(200) --服务器名
 6 ,@username varchar(200) --用户名,如果用NT验证方式,则为空''
 7 ,@password varchar(200) --密码
 8 ,@tbname varchar(500) --数据库.dbo.表名,如果不指定:.dbo.表名,则导出数据库的所有用户表
 9 ,@filename varchar(1000) --导入/导出路径/文件名,如果@tbname参数指明是导出整个数据库,则这个参数是文件存放路径,文件名自动用表名.txt
10 ,@isout bit --1为导出,0为导入
11 as
12 declare @sql varchar(8000)
13 if @tbname like '%.%.%' --如果指定了表名,则直接导出单个表
14 begin
15 set @sql='bcp ' @tbname
16  case when @isout=1 then ' out ' else ' in ' end
17  ' "' @filename '" /w'
18  ' /S ' @servername
19  case when isnull(@username,'')='' then '' else ' /U ' @username end
20  ' /P ' isnull(@password,'')
21 
22 exec master..xp_cmdshell @sql
23 
24 end
25 else
26 begin --导出整个数据库,定义游标,取出所有的用户表
27 
28 declare @m_tbname varchar(250)
29 if right(@filename,1)<>'' set @filename=@filename ''
30 set @m_tbname='declare #tb cursor for select name from ' @tbname '..sysobjects where xtype=''U'''
31 exec(@m_tbname)
32 
33 open #tb
34 
35 fetch next from #tb into @m_tbname
36 while @@fetch_status=0
37 begin
38 set @sql='bcp ' @tbname '..' @m_tbname
39  case when @isout=1 then ' out ' else ' in ' end
40  ' "' @filename @m_tbname '.txt " /w'
41  ' /S ' @servername
42  case when isnull(@username,'')='' then '' else ' /U ' @username end
43  ' /P ' isnull(@password,'')
44 
45 exec master..xp_cmdshell @sql
46 
47 fetch next from #tb into @m_tbname
48 end
49 
50 close #tb
51 deallocate #tb
52 end
53 go

View Code

补充:

1)、说明:复制表(只复制结构,源表名:a 新表名:b) (Access可用)

法一:select * into b from a where 1<>1

法二:select top 0 * into b from a

2)、说明:拷贝表(拷贝数据,源表名:a 目标表名:b) (Access可用)

insert into b(a, b, c) select d,e,f from b; 

3)、说明:跨数据库之间表的拷贝(具体数据使用绝对路径) (Access可用)

insert into b(a, b, c) select d,e,f from b in ‘具体数据库’ where 条件

例子:..from b in '"&Server.MapPath(".")&"data.mdb" &"' where..

4)、说明:子查询(表名1:a 表名2:b)

select a,b,c from a where a IN (select d from b ) 或者: select a,b,c from a where a IN (1,2,3) 

5)、说明:显示文章、提交人和最后回复时间

select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b

6)、说明:外连接查询(表名1:a 表名2:b)

select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c 

7)、说明:在线视图查询(表名1:a )

select * from (SELECT a,b,c FROM a) T where t.a > 1; 

8)、说明:between的用法,between限制查询数据范围时包括了边界值,not between不包括

select * from table1 where time between time1 and time2
select a,b,c, from table1 where a not between 数值1 and 数值2

9)、说明:in 的使用方法

select * from table1 where a [not] in (‘值1’,’值2’,’值4’,’值6’) 

10)、说明:两张关联表,删除主表中已经在副表中没有的信息

delete from table1 where not exists ( select * from table2 where table1.field1=table2.field1 )

11)、说明:四表联查问题

select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where ..... 

12)、说明:日程安排提前五分钟提醒

SQL: select * from 日程安排 where datediff('minute',f开始时间,getdate())>5 

13)、说明:一条sql 语句搞定数据库分页

select top 10 b.* from (select top 20 主键字段,排序字段 from 表名 order by 排序字段 desc) a,表名 b where b.主键字段 = a.主键字段 order by a.排序字段

14)、说明:前10条记录

select top 10 * form table1 where 范围 

15)、说明:选择在每一组b值相同的数据中对应的a最大的记录的所有信息(类似这样的用法可以用于论坛每月排行榜,每月热销产品分析,按科目成绩排名,等等.)

select a,b,c from tablename ta where a=(select max(a) from tablename tb where tb.b=ta.b) 

16)、说明:包括所有在 TableA 中但不在 TableB和TableC 中的行并消除所有重复行而派生出一个结果表

(select a from tableA ) except (select a from tableB) except (select a from tableC) 

17)、说明:随机取出10条数据

select top 10 * from tablename order by newid() 

18)、说明:随机选择记录

select newid()

19)、说明:删除重复记录

Delete from tablename where id not in (select max(id) from tablename group by col1,col2,...) 

20)、说明:列出数据库里所有的表名

select name from sysobjects where type='U'

21)、说明:列出表里的所有的

select name from syscolumns where id=object_id('TableName') 

22)、说明:列示type、vender、pcs字段,以type字段排列,case可以方便地实现多重选择,类似select 中的case。

select type,
sum(case vender when 'A' then pcs else 0 end),
sum(case vender when 'C' then pcs else 0 end),
sum(case vender when 'B' then pcs else 0 end)
FROM tablename group by type

显示结果:

图片 22

type vender pcs
电脑 A 1
电脑 A 1
光盘 B 2
光盘 A 2
手机 B 3
手机 C 3

图片 23

23)、说明:初始化表table1

TRUNCATE TABLE table1 

24)、说明:选择从10到15的记录

select top 5 * from (select top 15 * from table order by id asc) table_别名 order by id desc

 

回到目录

 

图片 24图片 25

 1 if exists(select 1 from sysobjects where name='File2Table' and objectproperty(id,'IsProcedure')=1)
 2 drop procedure File2Table
 3 go
 4 create procedure File2Table
 5 @servername varchar(200) --服务器名
 6 ,@username varchar(200) --用户名,如果用NT验证方式,则为空''
 7 ,@password varchar(200) --密码
 8 ,@tbname varchar(500) --数据库.dbo.表名,如果不指定:.dbo.表名,则导出数据库的所有用户表
 9 ,@filename varchar(1000) --导入/导出路径/文件名,如果@tbname参数指明是导出整个数据库,则这个参数是文件存放路径,文件名自动用表名.txt
10 ,@isout bit --1为导出,0为导入
11 as
12 declare @sql varchar(8000)
13 if @tbname like '%.%.%' --如果指定了表名,则直接导出单个表
14 begin
15 set @sql='bcp ' @tbname
16  case when @isout=1 then ' out ' else ' in ' end
17  ' "' @filename '" /w'
18  ' /S ' @servername
19  case when isnull(@username,'')='' then '' else ' /U ' @username end
20  ' /P ' isnull(@password,'')
21 
22 exec master..xp_cmdshell @sql
23 
24 end
25 else
26 begin --导出整个数据库,定义游标,取出所有的用户表
27 
28 declare @m_tbname varchar(250)
29 if right(@filename,1)<>'' set @filename=@filename ''
30 set @m_tbname='declare #tb cursor for select name from ' @tbname '..sysobjects where xtype=''U'''
31 exec(@m_tbname)
32 
33 open #tb
34 
35 fetch next from #tb into @m_tbname
36 while @@fetch_status=0
37 begin
38 set @sql='bcp ' @tbname '..' @m_tbname
39  case when @isout=1 then ' out ' else ' in ' end
40  ' "' @filename @m_tbname '.txt " /w'
41  ' /S ' @servername
42  case when isnull(@username,'')='' then '' else ' /U ' @username end
43  ' /P ' isnull(@password,'')
44 
45 exec master..xp_cmdshell @sql
46 
47 fetch next from #tb into @m_tbname
48 end
49 
50 close #tb
51 deallocate #tb
52 end
53 go

View Code

2.5、说明:删除新表

drop table tabname

2.10、说明:基本sql语句选择

图片 26

查询:select * from table1 where 范围
插入:insert into table1(field1,field2) s(1,2)
删除:delete from table1 where 范围
更新:update table1 set field1=1 where 范围
查找:select * from table1 where field1 like ’%1%’ ---like的语法
排序:select * from table1 order by field1,field2 [desc]
总数:select count * as totalcount from table1
求和:select sum(field1) as sum from table1
平均:select avg(field1) as avg from table1
最大:select max(field1) as max from table1
最小:select min(field1) as min from table1

图片 27

4.2、 导入Excel

SELECT *
FROM OpenDataSource( 'Microsoft.Jet.OLEDB.4.0',
'Data Source="c:test.xls";User ID=Admin;Password=;Extended properties=Excel 5.0')...xactions

SELECT cast(cast(科目编号 as numeric(10,2)) as nvarchar(255)) ' ' 转换后的别名
FROM OpenDataSource( 'Microsoft.Jet.OLEDB.4.0',
'Data Source="c:test.xls";User ID=Admin;Password=;Extended properties=Excel 5.0')...xactions

select * from OPENROWSET('MICROSOFT.JET.OLEDB.4.0','Excel 5.0;HDR=YES;DATABASE=c:Book1.xls',Sheet1$)

HDR=YES;Excel第一行当成标题行
HDR=NO;第一行不当成标题行

4.1、导出到excel

EXEC master..xp_cmdshell 'bcp SettleDB.dbo.shanghu out c:temp1.xls -c -q -S"GNETDATA/GNETDATA" -U"sa" -P""'

 

 

图片 28

图片 29

 1 if exists(select 1 from sysobjects where name='File2Table' and objectproperty(id,'IsProcedure')=1)
 2 drop procedure File2Table
 3 go
 4 create procedure File2Table
 5 @servername varchar(200) --服务器名
 6 ,@username varchar(200) --用户名,如果用NT验证方式,则为空''
 7 ,@password varchar(200) --密码
 8 ,@tbname varchar(500) --数据库.dbo.表名,如果不指定:.dbo.表名,则导出数据库的所有用户表
 9 ,@filename varchar(1000) --导入/导出路径/文件名,如果@tbname参数指明是导出整个数据库,则这个参数是文件存放路径,文件名自动用表名.txt
10 ,@isout bit --1为导出,0为导入
11 as
12 declare @sql varchar(8000)
13 if @tbname like '%.%.%' --如果指定了表名,则直接导出单个表
14 begin
15 set @sql='bcp ' @tbname
16  case when @isout=1 then ' out ' else ' in ' end
17  ' "' @filename '" /w'
18  ' /S ' @servername
19  case when isnull(@username,'')='' then '' else ' /U ' @username end
20  ' /P ' isnull(@password,'')
21 
22 exec master..xp_cmdshell @sql
23 
24 end
25 else
26 begin --导出整个数据库,定义游标,取出所有的用户表
27 
28 declare @m_tbname varchar(250)
29 if right(@filename,1)<>'' set @filename=@filename ''
30 set @m_tbname='declare #tb cursor for select name from ' @tbname '..sysobjects where xtype=''U'''
31 exec(@m_tbname)
32 
33 open #tb
34 
35 fetch next from #tb into @m_tbname
36 while @@fetch_status=0
37 begin
38 set @sql='bcp ' @tbname '..' @m_tbname
39  case when @isout=1 then ' out ' else ' in ' end
40  ' "' @filename @m_tbname '.txt " /w'
41  ' /S ' @servername
42  case when isnull(@username,'')='' then '' else ' /U ' @username end
43  ' /P ' isnull(@password,'')
44 
45 exec master..xp_cmdshell @sql
46 
47 fetch next from #tb into @m_tbname
48 end
49 
50 close #tb
51 deallocate #tb
52 end
53 go

图片 30

2.2、说明:删除数据库

drop database db-name 

三、sql技巧

4.5、导入DBF文件

图片 31

select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:VFP98data;
SourceType=DBF',
'select * from customer where country != "USA" order by country')
go

图片 32

 

2.1、说明:创建数据库

create database db-name

4.7、导出到Access

insert into openrowset('Microsoft.Jet.OLEDB.4.0',
'x:A.mdb';'admin';'',A表) select * from 数据库名..B表

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