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  • 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

    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;

    查询所有数据username字段的长度

    select LEN(username) from Users;

    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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  • 原文地址:https://www.cnblogs.com/demonxian3/p/7856142.html
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