Sql语句查看表结构

快速查看表对的就说明，及表字段描述及字段类型

--表描述  
SELECT tbs.name 表名,ds.value 描述   
FROM sys.extended_properties ds  
LEFT JOIN sysobjects tbs ON ds.major_id=tbs.id  
WHERE  ds.minor_id=0 and  
 tbs.name='Warrant_BaseInfo';--表名  
  


--快速查看表结构  
SELECT  CASE WHEN col.colorder = 1 THEN obj.name  
                  ELSE ''  
             END AS 表名,  
        col.colorder AS 序号 ,  
        col.name AS 列名 ,  
        ISNULL(ep.[value], '') AS 列说明 ,  
        t.name AS 数据类型 ,  
        col.length AS 长度 ,  
        ISNULL(COLUMNPROPERTY(col.id, col.name, 'Scale'), 0) AS 小数位数 ,  
        CASE WHEN COLUMNPROPERTY(col.id, col.name, 'IsIdentity') = 1 THEN '√'  
             ELSE ''  
        END AS 标识 ,  
        CASE WHEN EXISTS ( SELECT   1  
                           FROM     dbo.sysindexes si  
                                    INNER JOIN dbo.sysindexkeys sik ON si.id = sik.id  
                                                              AND si.indid = sik.indid  
                                    INNER JOIN dbo.syscolumns sc ON sc.id = sik.id  
                                                              AND sc.colid = sik.colid  
                                    INNER JOIN dbo.sysobjects so ON so.name = si.name  
                                                              AND so.xtype = 'PK'  
                           WHERE    sc.id = col.id  
                                    AND sc.colid = col.colid ) THEN '√'  
             ELSE ''  
        END AS 主键 ,  
        CASE WHEN col.isnullable = 1 THEN '√'  
             ELSE ''  
        END AS 允许空 ,  
        ISNULL(comm.text, '') AS 默认值  
FROM    dbo.syscolumns col  
        LEFT  JOIN dbo.systypes t ON col.xtype = t.xusertype  
        inner JOIN dbo.sysobjects obj ON col.id = obj.id  
                                         AND obj.xtype = 'U'  
                                         AND obj.status >= 0  
        LEFT  JOIN dbo.syscomments comm ON col.cdefault = comm.id  
        LEFT  JOIN sys.extended_properties ep ON col.id = ep.major_id  
                                                      AND col.colid = ep.minor_id  
                                                      AND ep.name = 'MS_Description'  
        LEFT  JOIN sys.extended_properties epTwo ON obj.id = epTwo.major_id  
                                                         AND epTwo.minor_id = 0  
                                                         AND epTwo.name = 'MS_Description'  
WHERE   obj.name = 'Ath_LoanApply_tbl'--表名  
ORDER BY col.colorder ;  

（1）
SELECT
表名=case when a.colorder=1 then d.name else '' end,
表说明=case when a.colorder=1 then isnull(f.value,'') else '' end,
字段序号=a.colorder,
字段名=a.name,
标识=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end,
主键=case when exists(SELECT 1 FROM sysobjects where xtype='PK' and parent_obj=a.id and name in (
SELECT name FROM sysindexes WHERE indid in(
SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid
))) then '√' else '' end,
类型=b.name,
占用字节数=a.length,
长度=COLUMNPROPERTY(a.id,a.name,'PRECISION'),
小数位数=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
允许空=case when a.isnullable=1 then '√'else '' end,
默认值=isnull(e.text,''),
字段说明=isnull(g.[value],'')
FROM syscolumns a
left join systypes b on a.xusertype=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
left join sysproperties f on d.id=f.id and f.smallid=0
--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

（2）

SQL2000系统表的应用
--1：获取当前数据库中的所有用户表

select Name from sysobjects where xtype='u' and status>=0

--2：获取某一个表的所有字段

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

--3：查看与某一个表相关的视图、存储过程、函数

select a.* from sysobjects a, syscomments b where a.id = b.id and b.text like '%表名%'

--4：查看当前数据库中所有存储过程

select name as 存储过程名称 from sysobjects where xtype='P'

--5：查询用户创建的所有数据库

select * from master..sysdatabases D where sid not in(select sid from master..syslogins where name='sa')

或者

select dbid, name AS DB_NAME from master..sysdatabases where sid <> 0x01

--6：查询某一个表的字段和数据类型

select column_name,data_type from information_schema.columns
where table_name = '表名'

--7:取得表字段的描述
select name,
(select value from sysproperties where id = syscolumns.id and smallid=syscolumns.colid) as 描述
from syscolumns where id=object_id('表名')