查询表结构

sqlCode：

--查询表结构（一）
use shop---数据库名
 Select
    col.[name]  as '字段名',
    col.[length]as '长度'  ,
    type.[name] as '类型'  ,
    pro.value   as '描述' 
 From syscolumns as col
 Left Join systypes as type on col.xtype = type.xtype
 Left Join sysProperties as pro on col.id = pro.id and col.colid = pro.smallid
 where col.id = (Select id From Sysobjects Where name = 'trole')


--查询表结构（二）
select name from syscolumns where id =(select id from sysobjects where name='trole') order by colorder 

--查询表结构 （三）
---------SQL2000查询所有的表结构-------
SELECT TOP 100 PERCENT --a.id,
       CASE WHEN a.colorder = 1 THEN d.name ELSE '' END AS 表名,
       CASE WHEN a.colorder = 1 THEN isnull(f.value, '') ELSE '' END AS 表说明,
       a.colorder AS 字段序号, a.name AS 字段名, CASE WHEN COLUMNPROPERTY(a.id,
       a.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 = a.id AND sc.colid = a.colid) THEN '√' ELSE '' END AS 主键,
       b.name AS 类型, a.length AS 长度, COLUMNPROPERTY(a.id, a.name, 'PRECISION')
       AS 精度, ISNULL(COLUMNPROPERTY(a.id, a.name, 'Scale'), 0) AS 小数位数,
       CASE WHEN a.isnullable = 1 THEN '√' ELSE '' END AS 允许空, ISNULL(e.text, '')
       AS 默认值, ISNULL(g.[value], '') AS 字段说明, d.crdate AS 创建时间,
       CASE WHEN a.colorder = 1 THEN d.refdate ELSE NULL END AS 更改时间
FROM dbo.syscolumns a LEFT OUTER JOIN
       dbo.systypes b ON a.xtype = b.xusertype INNER JOIN
       dbo.sysobjects d ON a.id = d.id AND d.xtype = 'U' AND
       d.status >= 0 LEFT OUTER JOIN
       dbo.syscomments e ON a.cdefault = e.id LEFT OUTER JOIN
       dbo.sysproperties g ON a.id = g.id AND a.colid = g.smallid AND
       g.name = 'MS_Description' LEFT OUTER JOIN
       dbo.sysproperties f ON d.id = f.id AND f.smallid = 0 AND
       f.name = 'MS_Description'
ORDER BY d.name, a.colorder 

---------------oracle 查询某张表结构-------------
select COLUMN_NAME,DATA_TYPE from USER_TAB_COLS where TABLE_NAME='HFXX';

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