查询表的列名和相关信息

SELECT
    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 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,
    类型       = b.name,
    长度       = COLUMNPROPERTY(a.id,a.name,'PRECISION'),
    占用字节数 = a.length,
    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     = 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  
where
    d.name='Users'    --如果只查询指定表,加上此条件
order by
    a.id,a.colorder