sql-server数据库常用语句

时间：2023-03-09 17:49:29
sql-server数据库常用语句

查看所有数据库名

select name from master..Sysdatabases order by name;

查看当前数据所有表

select name from sysobjects where xtype = 'U'  ORDER BY name

查询所有表的数据结构（最牛逼的）

SELECT (case when a.colorder=1 then d.name else null end) 表名,

a.colorder 字段序号,a.name 字段名,

(case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 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) 主键,b.name 类型,a.length 占用字节数,

COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,

isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,(case when a.isnullable=1 then '√'else '' end) 允许空,

isnull(e.text,'') 默认值,isnull(g.[value], ' ') AS [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 sys.extended_properties g on a.id=g.major_id AND a.colid=g.minor_id

left join sys.extended_properties f on d.id=f.class and f.minor_id=0

where b.name is not null

--WHERE d.name='要查询的表' --如果只查询指定表,加上此条件

order by a.id,a.colorder

sql-server数据库常用语句

其他操作符合sql标准：

--库操作
create database test;
use test;

--表操作
drop table Users;

create table users(id int,username char(100),password char(100),remarks char(100));

--数据操作

insert into Users values(1,'admin','admin123','This is administrator for system');
update Users set username = 'king',password = '123456' where username = 'admin';
delete from Users where username = 'king';

select * from Users;

注意：字符串需要使用单引号包围，如果输入的名称含有空格，那么可以使用双引号来标明。

其他操作：

以第一个字段进行排序

select * from Users order by 1;

sql-server数据库常用语句

查询所有数据username字段的长度

select LEN(username) from Users;

sql-server数据库常用语句

创建一个自动增长ID的表

create table users(id int identity(1,1) primary key, username varchar(200),password varchar(200));

查询所有的库

SELECT Name FROM Master..SysDatabases ORDER BY Name

查询所有用户创建的表

select name from sysobjects where xtype= 'u'

查询某库中所有用户创建的表

SELECT Name FROM SCHEMA_NAME..SysObjects Where XType='U' ORDER BY Name

查询某表当中所有的字段

SELECT Name FROM SysColumns WHERE id=Object_Id('TABLE_NAME')

SQLserver2000开启远程连接及故障排除

https://www.cnblogs.com/furenjun/archive/2007/12/27/1017116.html

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