SELECT    (case when a.colorder=1 then d.name else '' end) as 表名,--如果表名相同就返回空   syscolumns(表字段信息表) a  sysobjects d      a.colorder as 字段序号,        a.name as 字段名,        (case when COLUMNPROPERTY( a.id,a.name, 'IsIdentity' )=1 then '√' else '' end) as 标识,   --返回IsIdentity的值，IsIdentity只有两个值：0、1      (case when (SELECT count(*) FROM sysobjects--查询主键                        WHERE (name in                                 (SELECT name FROM sysindexes                                 WHERE (id = a.id)   AND (indid in                                         (SELECT indid FROM sysindexkeys                                          WHERE (id = a.id) AND (colid in                                             (SELECT colid FROM syscolumns                                            WHERE (id = a.id) AND (name = a.name))                            )))))             AND (xtype = 'PK' ))>0 then '√' else '' end) as 主键,--查询主键END   b.name as 类型,   --systypes b a.length as 占用字节数,   COLUMNPROPERTY(a.id,a.name,'PRECISION' ) as    长度,   isnull(COLUMNPROPERTY(a.id,a.name,'Scale' ),0) as 小数位数,   (case when a.isnullable=1 then '√' else '' end) as 允许空,   isnull(e.text,'' ) as 默认值,   --syscomments e isnull(g.[value],'' ) AS 字段说明    --sys.extended_properties g (字段信息表) FROM syscolumns a left join systypes b    on a.xtype=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='systempara' --所要查询的表   order by a.id,a.colorder