从Sql server获取表字段属性信息，注释信息

select b.[value] from sys.columns a left join sys.extended_properties b on a.object_id=b.major_id
and a.column_id=b.minor_id inner join sysobjects c on a.column_id=c.id
and a.[name]=''列名'' and c.[name]=''表名''

实例：

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 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 sys.extended_properties g on a.id=g.major_id and a.colid=g.minor_id
left join sys.extended_properties f on d.id=f.major_id and f.minor_id=0
--where d.name=''orders'' --如果只查询指定表,加上此条件
order by a.id,a.colorder