SQL查询表字段、字段说明、类型、长度、主键

SELECT  表名=d.name,case when a.colorder=1 then d.name 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 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.xtype=b.xusertype
 inner join sysobjects d on a.id=d.id and d.xtype='U'
 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 
 where d.name='表名'
order by a.id,a.colorder