SELECT        表名       = case when a.colorder=1 then d.name else ‘‘ end,       表说明     = case when a.colorder=1 then isnull(f.value,‘‘) else ‘‘ end,       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,       占用字节数 = a.length,       长度       = COLUMNPROPERTY(a.id,a.name,‘PRECISION‘),       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     = isnull(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     left join sys.extended_properties f   on d.id=f.major_id and f.minor_id=0   where d.name=‘tb_users‘    --如果只查询指定表,加上此条件   order by a.id,a.colorder      

select a.name 列名, c.name 数据类型,a.max_length 长度,a.is_nullable 是否为空     from sys.columns a, sys.tables b, sys.types c    where a.object_id=b.object_id       and a.system_type_id=c.system_type_id       and b.name=‘tb_name‘       order by a.column_id   

SELECT a.name, b.rows   FROM sysobjects AS a INNER JOIN sysindexes AS b    ON a.id = b.id   WHERE (a.type = ‘u‘) AND (b.indid IN (0, 1))   ORDER BY b.rows DESC