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')