将SQL Server中所有表的列信息显示出来:
　　SELECT SysObjects.Name as tb_name, SysColumns.Name as col_name,
　　SysTypes.Name as col_type, SysColumns.Length as col_len, isnull
　　(SysProperties.Value,SysColumns.Name) as col_memo,
　　case when SysColumns.name in
　　(select 主键=a.name
　　FROM syscolumns a
　　inner join sysobjects b on a.id=b.id and
　　b.xtype='U' and b.name<>'dtproperties'
　　where 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
　　)))
　　and b.name=SysObjects.Name
　　)
　　then 1 else 0 end as is_key
　　FROM SysObjects,SysTypes,SysColumns
　　LEFT JOIN SysProperties ON (Syscolumns.Id = Sysproperties.Id AND
　　Syscolumns.Colid = Sysproperties.Smallid)
　　WHERE (Sysobjects.Xtype ='u' OR Sysobjects.Xtype ='v')
　　AND Sysobjects.Id = Syscolumns.Id AND SysTypes.XType = Syscolumns.XType
　　AND SysTypes.Name <> 'sysname' AND Sysobjects.
　　Name Like '%' ORDER By SysObjects.Name, SysColumns.colid