列出SQL SERVER数据库 所有表，字段名，主键，类型，长度，小数位数等信息

select
       (case when a.colorder=1 then d.name else '' end)表名,
       a.colorder 字段序号,
       a.name 字段名,
       (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,
       (case when (select count(*)
       from sysobjects
       where (name in
                 (select name
                from sysindexes
                where (id = a.id) and (indid in
                          (select indid
                         from sysindexkeys
                         where (id = a.id) and (colid in
                                   (select colid
                                  from syscolumns
                                  where (id = a.id) and (name = a.name))))))) and
              (xtype = 'PK'))>0 then '√' else '' end) 主键,
       b.name 类型,
       a.length 占用字节数,
       COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,
       isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,
       (case when a.isnullable=1 then '√'else '' end) 允许空,
       isnull(e.text,'') 默认值,
       isnull(g.[value],'') as 字段说明   
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' and  d.name<>'dtproperties'
left join syscomments e
on a.cdefault=e.id
left join sysproperties g
on a.id=g.id and a.colid = g.smallid 
order by a.id,a.colorder