关键部分如下：

------sqlserver 查询某个表的列名称、说明、备注、类型等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 aleft join     systypes b on     a.xusertype=b.xusertypeinner join     sysobjects d on     a.id=d.id  and d.xtype='U' and  d.name<>'dtproperties'left join     syscomments e on     a.cdefault=e.idleft join sys.extended_properties   g on     a.id=G.major_id and a.colid=g.minor_id  left joinsys.extended_properties fon     d.id=f.major_id and f.minor_id=0where     d.name='Sys_User'    --如果只查询指定表,加上此where条件，tablename是要查询的表名；去除where条件查询所有的表信息order by     a.id,a.colorder