1、创建表

create table test_rollup
(
type_name varchar2(10),
type_value number
);

2、插入数据结果

select * from test_rollup;
a	123
a	423
a	523
b	223
b	283
c	103
c	843
c	899
c	100

3、使用rollup函数

select type_name, sum(type_value)
  from test_rollup
 group by rollup(type_name);
a	1069
b	506
c	1945
	3520

4、使用rollup和grouping函数

select type_name, sum(type_value), grouping(type_name)
  from test_rollup
 group by rollup(type_name);
a	1069	0
b	506	0
c	1945	0
	3520	1

5、显示统计信息

select decode(grouping(type_name), 0, type_name, '总计'), sum(type_value)
  from test_rollup
 group by rollup(type_name);
a	1069
b	506
c	1945
总计	3520

1、创建查看隐藏参数视图（show_hidden_v$parameter）

--conn "/ as sysdba"
create or replace view show_hidden_v$parameter
    (INST_ID, NUM , NAME , TYPE , VALUE , DISPLAY_VALUE, ISDEFAULT , ISSES_MODIFIABLE , ISSYS_MODIFIABLE , ISINSTANCE_MODIFIABLE,
    ISMODIFIED , ISADJUSTED , ISDEPRECATED, DESCRIPTION, UPDATE_COMMENT, HASH)
    as
    select x.inst_id,
           x.indx + 1,
           ksppinm,
           ksppity,
           ksppstvl,
          ksppstdvl,
          ksppstdf,
          decode(bitand(ksppiflg / 256, 1), 1, 'TRUE', 'FALSE'),
          decode(bitand(ksppiflg / 65536, 3),
                 1,
                 'IMMEDIATE',
                 2,
                 'DEFERRED',
                 3,
                 'IMMEDIATE',
                 'FALSE'),
          decode(bitand(ksppiflg, 4),
                 4,
                 'FALSE',
                 decode(bitand(ksppiflg / 65536, 3), 0, 'FALSE', 'TRUE')),
          decode(bitand(ksppstvf, 7), 1, 'MODIFIED', 4, 'SYSTEM_MOD', 'FALSE'),
          decode(bitand(ksppstvf, 2), 2, 'TRUE', 'FALSE'),
          decode(bitand(ksppilrmflg / 64, 1), 1, 'TRUE', 'FALSE'),
          ksppdesc,
          ksppstcmnt,
          ksppihash
     from x$ksppi x, x$ksppcv y
    where (x.indx = y.indx);

2、授权用户访问隐藏视图（show_hidden_v$parameter）

--conn "/ as sysdba"
grant select on show_hidden_v$parameter to chf;

3、建立同义词（v$parameter）

--conn chf/xifenfei（sys下面已经有该同义词）
create synonym v$parameter for sys.show_hidden_v$parameter;

4、直接查询隐藏参数

select
x.ksppinm name,
x.ksppdesc description,
y.ksppstvl value,
y.ksppstdf isdefault,
decode(bitand(y.ksppstvf,7),1,'MODIFIED',4,'SYSTEM_MOD','FALSE') ismod,
decode(bitand(y.ksppstvf,2),2,'TRUE','FALSE') isadjusted from 
sys.x$ksppi x,
sys.x$ksppcv y
where
x.inst_id=userenv('Instance') and
y.inst_id=userenv('Instance') and
x.indx=y.indx and
x.ksppinm like '%_&par%'
order by
translate(x.ksppinm,'_','');

因为开发需求需要，存储多个列的结果集，使用table()可以实现
1、创建type

create or replace type t_yqjjrgstj as object
(
  THSCODE   VARCHAR2(96),
  GSJC      VARCHAR2(120) ,
  SSHY      VARCHAR2(180),
  STOCKCODE VARCHAR2(18) ,
  KGLX      VARCHAR2(360),
  GPLX      VARCHAR2(180),
  SSXQ      VARCHAR2(60),
  H_CODE    VARCHAR2(30),
  --额外数据，挑选条件中需要
  JYSDM     VARCHAR2(36) ,--交易所代码
  EJHY      VARCHAR2(180),--证监会二级分类
  JJKGR     VARCHAR2(360)--实际控股人
)

2、实例化type

create or replace type t_jgb_yqjjrgstj as table of t_yqjjrgstj;

3、创建函数

create or replace function f_gjb_yqjjrgstj(in_date in date default sysdate)
  return t_jgb_yqjjrgstj
  PIPELINED as
  v_test_1 t_jgb_yqjjrgstj := t_jgb_yqjjrgstj();
begin
  for t in (select * from test_yqjbzl) loop
    pipe row(t_yqjjrgstj(t.thscode,
                         t.gsjc,
                         t.sshy,
                         t.stockcode,
                         t.kglx,
                         t.gplx,
                         t.ssxq,
                         t.h_code,
                         t.jysdm,
                         t.ejhy,
                         t.jjkgr));
  end loop;
  return;
end f_gjb_yqjjrgstj;

4、测试

select thscode "同花顺" from table(f_gjb_yqjjrgstj()) where SSXQ='北京';