select
obj.name as ‘表名‘
,c.name as ‘字段名称‘
,t.name as ‘字段类型‘
,c.Length as ‘占用字节‘
,COLUMNPROPERTY(c.id,c.name,‘PRECISION‘) as ‘长度‘
,isnull(COLUMNPROPERTY(c.id,c.name,‘Scale‘),0) as ‘小数位数‘
,case(c.isnullable) when ‘1‘ then ‘√‘ else ‘‘ end as ‘是否为空‘
,ISNULL(CM.text,‘‘) as ‘默认值‘
,case(
(select 1 from sysobjects where xtype=‘PK‘ and parent_obj=c.id and name in (
select name from sysindexes where indid in(
select indid from sysindexkeys where id = c.id and colid=c.colid)))
) when ‘1‘ then ‘√‘ else ‘‘ end as ‘是否主键‘
,case(COLUMNPROPERTY(c.id,c.name,‘IsIdentity‘)) when ‘1‘ then ‘√‘ else ‘‘ end as ‘自动增长‘

,isnull(ETP.value,‘‘) AS ‘字段描述‘

from syscolumns c
inner join systypes t on c.xusertype = t.xusertype
left join sys.extended_properties ETP on ETP.major_id = c.id and ETP.minor_id = c.colid and ETP.name =‘MS_Description‘
left join syscomments CM on c.cdefault=CM.id
left join sysobjects obj on c.id=obj.id
where c.id = object_id(‘表名称‘)

查询表结构