Sql获取表的信息

select   
    [表名]=c.Name, 
    [表说明]=isnull(f.[value],''),  
    [列名]=a.Name,  
    [列序号]=a.Column_id,  
    [标识]=case when is_identity=1 then '是' else '' end,  
    [主键]=case when exists(select 1 from sys.objects x join sys.indexes y on x.Type=N'PK' and x.Name=y.Name   
                        join sysindexkeys z on z.ID=a.Object_id and z.indid=y.index_id and z.Colid=a.Column_id)  
                    then '是' else '' end,  
    [类型]=b.Name,  
    [字节数]=case when a.[max_length]=-1 and b.Name!='xml' then 'max/2G'   
            when b.Name='xml' then '2^31-1字节/2G'  
            else rtrim(a.[max_length]) end,  
    [长度]=case when ColumnProperty(a.object_id,a.Name,'Precision')=-1 then '2^31-1'  
                else rtrim(ColumnProperty(a.object_id,a.Name,'Precision')) end,  
    [小数]=isnull(ColumnProperty(a.object_id,a.Name,'Scale'),0),  
    [是否为空]=case when a.is_nullable=1 then '是' else '' end,  
    [列说明]=isnull(e.[value],''),  
    [默认值]=isnull(d.text,'')      
from   
    sys.columns a  
left join  
    sys.types b on a.user_type_id=b.user_type_id  
inner join  
    sys.objects c on a.object_id=c.object_id and c.Type='U'  
left join  
    syscomments d on a.default_object_id=d.ID  
left join  
    sys.extended_properties e on e.major_id=c.object_id and e.minor_id=a.Column_id and e.class=1   
left join  
    sys.extended_properties f on f.major_id=c.object_id and f.minor_id=0 and f.class=1