Sql 查询表结构主键、类型、长度、说明等信息

SELECT d.name 表名, case when a.colorder=1 then isnull(f.value,'') else '' end 表说明,
    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 exists(SELECT 1 FROM sysobjects where xtype='PK' and parent_obj=a.id 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 主键,
    b.name 类型, a.length 占用字节数, COLUMNPROPERTY(a.id,a.name,'PRECISION') 长度,
    isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) 小数位数, case when a.isnullable=1 then '√'else '' end 允许空,
    isnull(e.text,'') 默认值, isnull(g.[value],'') 字段说明
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='表名' --这个条件查询单表，不加查询所有表
order by a.id,a.colorder