Oracle-12：伪列rowid和rownum

------------吾亦无他,唯手熟尔，谦卑若愚，好学若饥-------------

伪列：不真实存储在真表中，但是我们可以查询到
不能对伪列进行增删改操作！

分页可以用rownum来分！！！！！！！（因为oracle中没有limit）

放一份数据库脚本，供测试使用

create table DEPT
(deptno NUMBER(2) not null,dname  VARCHAR2(20),loc    VARCHAR2(13)
);alter table DEPTadd constraint PK_DEPT primary key (DEPTNO);create table TEACHER
(tno       NUMBER(4) not null,tname     VARCHAR2(30) not null,tid       CHAR(18),gendar    CHAR(3),birthdate DATE,job       VARCHAR2(20),hiredate  DATE,sal       NUMBER(7,2),deptno    NUMBER(2),mgrno     NUMBER(4),comm      NUMBER(7,2)
);insert into DEPT (deptno, dname, loc)
values (40, '人力部', '北京海淀');
insert into DEPT (deptno, dname, loc)
values (30, '产品部', '北京海淀');
insert into DEPT (deptno, dname, loc)
values (20, '招生部', '上海虹桥');
insert into DEPT (deptno, dname, loc)
values (10, '研究院', '北京海淀');
insert into DEPT (deptno, dname, loc)
values (50, '系统部', '北京昌平');
commit;insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1002, '赵辉', '110101760609001   ', '男', to_date('09-06-1976', 'dd-mm-yyyy'), '考试专员', to_date('23-05-2006 02:40:40', 'dd-mm-yyyy hh24:mi:ss'), 29370.95, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1003, '杨利乐', '110101198705256045', '女', to_date('25-05-1987', 'dd-mm-yyyy'), '考试专员', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 7134.32, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1004, '王益辉', '110101199108154770', '男', to_date('15-08-1991', 'dd-mm-yyyy'), '营销专员', to_date('16-01-2012 03:12:43', 'dd-mm-yyyy hh24:mi:ss'), 30737.36, 20, null, 2300.00);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1006, '秦璐璐', '110101199004153068', '女', to_date('14-04-1990', 'dd-mm-yyyy'), '运维工程师', to_date('20-06-2012 00:47:09', 'dd-mm-yyyy hh24:mi:ss'), 9013.25, 10, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1007, '梁改焕', '110101196911206548', '女', to_date('20-11-1969', 'dd-mm-yyyy'), '讲师', to_date('13-06-2006 23:07:02', 'dd-mm-yyyy hh24:mi:ss'), 8664.16, 50, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1008, '冯爱仙', '110101196804021521', '女', to_date('02-04-1968', 'dd-mm-yyyy'), '讲师', to_date('06-06-2006 13:41:50', 'dd-mm-yyyy hh24:mi:ss'), 29936.29, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1009, '秦亚杰', '110101196312163531', '男', to_date('16-12-1963', 'dd-mm-yyyy'), '岗位分析师', to_date('13-07-2005 06:32:30', 'dd-mm-yyyy hh24:mi:ss'), 24991.44, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1010, '刘浩星', '110101198806283516', '男', to_date('28-06-1988', 'dd-mm-yyyy'), '考试专员', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 22645.92, null, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1011, '秦春叶', '110101197103033540', '女', to_date('03-03-1971', 'dd-mm-yyyy'), '网络营销师', to_date('07-07-2007 16:02:04', 'dd-mm-yyyy hh24:mi:ss'), 31653.23, 50, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1012, '陈水花', '110101192811043026', '女', to_date('04-11-1928', 'dd-mm-yyyy'), '考试专员', to_date('29-01-2005 23:21:59', 'dd-mm-yyyy hh24:mi:ss'), 29773.37, 20, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1013, '马付妮', '110101195806133522', '女', to_date('13-06-1958', 'dd-mm-yyyy'), '研发', to_date('17-11-2004 08:54:04', 'dd-mm-yyyy hh24:mi:ss'), 17041.60, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1015, '刘得安', '110101195210083518', '男', to_date('08-10-1952', 'dd-mm-yyyy'), '考试专员', to_date('13-03-2005 23:25:37', 'dd-mm-yyyy hh24:mi:ss'), 30356.99, 20, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1016, '高利芹', '110101198307276020', '女', to_date('27-07-1983', 'dd-mm-yyyy'), '岗位分析师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 25751.36, null, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1017, '刘志刚', '110101197806164493', '男', to_date('16-06-1978', 'dd-mm-yyyy'), '运维工程师', to_date('10-05-2008 13:46:33', 'dd-mm-yyyy hh24:mi:ss'), 22344.73, 20, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1018, '高心立', '110101194102076011', '男', to_date('07-02-1941', 'dd-mm-yyyy'), '网络营销师', to_date('03-03-2005 15:17:07', 'dd-mm-yyyy hh24:mi:ss'), 19981.02, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1019, '徐丽', '11010119790809354X', '男', to_date('09-08-1979', 'dd-mm-yyyy'), '研发', to_date('09-12-2009 18:37:22', 'dd-mm-yyyy hh24:mi:ss'), 10950.33, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1021, '刘志红', '110101196504284452', '男', to_date('28-04-1965', 'dd-mm-yyyy'), '岗位分析师', to_date('20-09-2011 10:51:33', 'dd-mm-yyyy hh24:mi:ss'), 7122.60, 20, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1022, '孔鹏飞', '110101198603304014', '男', to_date('30-03-1986', 'dd-mm-yyyy'), '人力资源师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 7045.28, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1023, '李建坡', '110101731107301   ', '男', to_date('07-11-1973', 'dd-mm-yyyy'), '网络营销师', to_date('04-07-2009 06:28:20', 'dd-mm-yyyy hh24:mi:ss'), 21133.91, 50, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1024, '冯爱敏', '110101196907283840', '女', to_date('18-07-1969', 'dd-mm-yyyy'), '营销专员', to_date('12-09-2005 22:41:06', 'dd-mm-yyyy hh24:mi:ss'), 3360.91, 20, null, 50000.00);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1025, '薛栓成', '110101400710051   ', '男', to_date('10-07-1940', 'dd-mm-yyyy'), '网络营销师', to_date('03-09-2007 14:55:06', 'dd-mm-yyyy hh24:mi:ss'), 12136.65, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1026, '牛伟伟', '11010119851120602X', '女', to_date('20-11-1985', 'dd-mm-yyyy'), '岗位分析师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 6622.66, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1027, '郭香云', '110101196010154525', '女', to_date('15-10-1960', 'dd-mm-yyyy'), '网络营销师', to_date('03-05-2005 13:01:22', 'dd-mm-yyyy hh24:mi:ss'), 26436.18, 50, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1028, '朱花枝', '110101195605154028', '女', to_date('15-05-1956', 'dd-mm-yyyy'), '研发', to_date('11-09-2007 07:41:01', 'dd-mm-yyyy hh24:mi:ss'), 10095.22, 50, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1029, '李岗', '110101196505163095', '男', to_date('16-05-1965', 'dd-mm-yyyy'), '岗位分析师', to_date('09-11-2007 17:26:38', 'dd-mm-yyyy hh24:mi:ss'), 23928.84, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1030, '李军会', '110101197706152524', '男', to_date('15-06-1977', 'dd-mm-yyyy'), '营销专员', to_date('12-05-2007 19:48:21', 'dd-mm-yyyy hh24:mi:ss'), 3492.19, 20, null, 25000.00);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1031, '孙龙举', '110101198908306037', '男', to_date('30-08-1989', 'dd-mm-yyyy'), '运维工程师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 4323.84, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1032, '韩朝旭', '110101199003270513', '男', to_date('27-03-1900', 'dd-mm-yyyy'), '人力资源师', to_date('11-09-2010 17:54:30', 'dd-mm-yyyy hh24:mi:ss'), 13740.92, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1033, '孙少光', '110101198809274535', '男', to_date('27-09-1988', 'dd-mm-yyyy'), '网络营销师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 19778.62, 50, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1035, '邓香敏', '110101196607163109', '女', to_date('16-07-1966', 'dd-mm-yyyy'), '人力资源师', to_date('12-04-2007 17:47:14', 'dd-mm-yyyy hh24:mi:ss'), 29463.38, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1037, '霍振方', '110101198411070014', '男', to_date('07-11-1984', 'dd-mm-yyyy'), '讲师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 23731.31, 40, 1087, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1038, '许双鸽', '110101781217004   ', '女', to_date('17-12-1978', 'dd-mm-yyyy'), '网络营销师', to_date('05-09-2007 18:45:00', 'dd-mm-yyyy hh24:mi:ss'), 16512.52, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1040, '张春红', '110101197806176089', '女', to_date('17-06-1978', 'dd-mm-yyyy'), '运维工程师', to_date('21-11-2004 06:52:30', 'dd-mm-yyyy hh24:mi:ss'), 31728.83, 10, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1041, '卢玉莲', '110101510606004   ', '女', to_date('06-06-1951', 'dd-mm-yyyy'), '人力资源师', to_date('30-03-2009 17:05:45', 'dd-mm-yyyy hh24:mi:ss'), 17596.43, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1042, '李军会', '110101197706152524', '男', to_date('15-06-1977', 'dd-mm-yyyy'), '讲师', to_date('13-06-2008 03:24:47', 'dd-mm-yyyy hh24:mi:ss'), 8443.59, 50, 1008, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1043, '朱水娃', '110101195210033512', '男', to_date('03-10-1952', 'dd-mm-yyyy'), '讲师', to_date('11-10-2009 03:40:53', 'dd-mm-yyyy hh24:mi:ss'), 9123.09, 30, 1008, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1045, '高大荣', '110101195504073528', '女', to_date('07-04-1955', 'dd-mm-yyyy'), '考试专员', to_date('07-12-2005 14:56:05', 'dd-mm-yyyy hh24:mi:ss'), 4000.00, 10, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1046, '秦付根', '110101195301034035', '男', to_date('03-01-1953', 'dd-mm-yyyy'), '讲师', to_date('10-12-2004 22:51:51', 'dd-mm-yyyy hh24:mi:ss'), 16420.33, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1047, '樊增妮', '110101410715352   ', '女', to_date('15-07-1941', 'dd-mm-yyyy'), '网络营销师', to_date('02-12-2005 14:41:54', 'dd-mm-yyyy hh24:mi:ss'), 13316.01, 20, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1048, '宋素敏', '11010119720111458X', '女', to_date('11-02-1972', 'dd-mm-yyyy'), '岗位分析师', to_date('26-09-2004 12:15:57', 'dd-mm-yyyy hh24:mi:ss'), 2142.92, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1049, '李记', '110101194803256012', '男', to_date('25-03-1948', 'dd-mm-yyyy'), '网络营销师', to_date('23-03-2006 19:12:45', 'dd-mm-yyyy hh24:mi:ss'), 13866.09, 50, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1050, '秦单风', '110101198911153625', '女', to_date('15-11-1989', 'dd-mm-yyyy'), '考试专员', to_date('21-10-2012 05:31:34', 'dd-mm-yyyy hh24:mi:ss'), 21419.38, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1051, '秦占豪', '110101198509034011', '男', to_date('03-09-1985', 'dd-mm-yyyy'), '讲师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 31564.79, 40, 1087, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1054, '张利娟', '110101197901173062', '女', to_date('17-01-1979', 'dd-mm-yyyy'), '网络营销师', to_date('08-05-2011 22:37:13', 'dd-mm-yyyy hh24:mi:ss'), 7419.99, 50, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1055, '陈向琼', '11010119871010354X', '男', to_date('10-10-1987', 'dd-mm-yyyy'), '讲师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 4000.00, 10, 1087, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1056, '杨晓磊', '110101199105106079', '男', to_date('10-05-1991', 'dd-mm-yyyy'), '研发', to_date('05-04-2012 22:16:05', 'dd-mm-yyyy hh24:mi:ss'), 20812.41, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1057, '黄芳菊', '110101196611133520', '女', to_date('13-11-1966', 'dd-mm-yyyy'), '网络营销师', to_date('04-07-2008 17:36:20', 'dd-mm-yyyy hh24:mi:ss'), 12711.46, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1058, '李红勤', '110101197209084047', '女', to_date('08-09-1972', 'dd-mm-yyyy'), '运维工程师', to_date('01-03-2007 05:57:34', 'dd-mm-yyyy hh24:mi:ss'), 21119.95, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1060, '薛栓成', '110101400710051   ', '男', to_date('10-07-1940', 'dd-mm-yyyy'), '考试专员', to_date('22-08-2007 08:06:47', 'dd-mm-yyyy hh24:mi:ss'), 24544.66, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1061, '高发娃', '110101192905226032', '男', to_date('22-05-1929', 'dd-mm-yyyy'), '运维工程师', to_date('12-12-2004 22:49:04', 'dd-mm-yyyy hh24:mi:ss'), 23458.34, 10, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1062, '李新昌', '110101196403106013', '男', to_date('10-03-1964', 'dd-mm-yyyy'), '研发', to_date('01-04-2011 18:00:33', 'dd-mm-yyyy hh24:mi:ss'), 18605.46, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1065, '赵永刚', '110101197507310014', '男', to_date('31-07-1975', 'dd-mm-yyyy'), '岗位分析师', to_date('05-12-2009 15:00:29', 'dd-mm-yyyy hh24:mi:ss'), 3155.96, 20, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1067, '冯世伟', '110101198811154532', '男', to_date('15-11-1988', 'dd-mm-yyyy'), '讲师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 17854.88, 40, 1087, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1068, '张延付', '110101197005233514', '男', to_date('23-05-1970', 'dd-mm-yyyy'), '岗位分析师', to_date('21-05-2009 10:16:16', 'dd-mm-yyyy hh24:mi:ss'), 24294.43, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1070, '陈粉', '110101195801206040', '女', to_date('20-01-1958', 'dd-mm-yyyy'), '营销专员', to_date('29-06-2011 21:27:04', 'dd-mm-yyyy hh24:mi:ss'), 17708.56, 20, null, 600.00);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1071, '张根祥', '110101194412126513', '男', to_date('12-12-1944', 'dd-mm-yyyy'), '岗位分析师', to_date('06-10-2006 12:14:34', 'dd-mm-yyyy hh24:mi:ss'), 8802.52, null, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1074, '李秋彩', '110101197411186020', '女', to_date('18-11-1974', 'dd-mm-yyyy'), '考试专员', to_date('09-04-2005 01:11:29', 'dd-mm-yyyy hh24:mi:ss'), 19315.97, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1075, '李建玲', '110101198110164423', '女', to_date('16-10-1981', 'dd-mm-yyyy'), '运维工程师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 9023.25, 50, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1076, '张仙', '110101530824316   ', '女', to_date('24-08-1953', 'dd-mm-yyyy'), '考试专员', to_date('09-05-2011 11:15:29', 'dd-mm-yyyy hh24:mi:ss'), 8654.83, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1077, '朱金典', '110101196810023531', '男', to_date('02-10-1968', 'dd-mm-yyyy'), '营销专员', to_date('11-01-2008 11:13:31', 'dd-mm-yyyy hh24:mi:ss'), 6687.97, 20, null, 2700.00);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1079, '孙玉环', '110101195006056047', '女', to_date('05-06-1950', 'dd-mm-yyyy'), '考试专员', to_date('17-11-2008 12:48:12', 'dd-mm-yyyy hh24:mi:ss'), 7490.24, 20, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1080, '邢中景', '110101198208284519', '男', to_date('28-08-1982', 'dd-mm-yyyy'), '运维工程师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 24990.57, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1081, '韩巧真', '110101198404190026', '女', to_date('19-04-1984', 'dd-mm-yyyy'), '人力资源师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 9880.26, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1084, '杜巧琴', '110101196201036089', '女', to_date('03-01-1962', 'dd-mm-yyyy'), '岗位分析师', to_date('13-01-2011 16:11:23', 'dd-mm-yyyy hh24:mi:ss'), 21655.36, 20, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1085, '席妞娃', '110101194601154026', '女', to_date('15-01-1946', 'dd-mm-yyyy'), '运维工程师', to_date('15-08-2008 06:36:11', 'dd-mm-yyyy hh24:mi:ss'), 24615.12, 20, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1087, '薛素粉', '110101196701044528', '女', to_date('04-01-1967', 'dd-mm-yyyy'), '讲师', to_date('10-09-2007 06:07:14', 'dd-mm-yyyy hh24:mi:ss'), 12357.56, null, 1008, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1088, '王雪英', '110101193311264521', '女', to_date('26-11-1933', 'dd-mm-yyyy'), '岗位分析师', to_date('18-02-2006 23:37:15', 'dd-mm-yyyy hh24:mi:ss'), 23670.53, 10, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1089, '刘秀菊', '110101530414306   ', '女', to_date('14-04-1953', 'dd-mm-yyyy'), '研发', to_date('11-09-2004 18:17:49', 'dd-mm-yyyy hh24:mi:ss'), 22608.20, null, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1090, '刘芳芳', '110101198912216025', '女', to_date('21-12-1989', 'dd-mm-yyyy'), '网络营销师', to_date('10-10-2012 00:24:11', 'dd-mm-yyyy hh24:mi:ss'), 9749.45, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1091, '郝方方', '110101198605165580', '女', to_date('16-05-1986', 'dd-mm-yyyy'), '运维工程师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 5944.72, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1092, '赵利萍', '110101196712063564', '女', to_date('06-12-1967', 'dd-mm-yyyy'), '岗位分析师', to_date('01-08-2006 17:26:08', 'dd-mm-yyyy hh24:mi:ss'), 4575.09, 30, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1093, '杨联星', '110101195312284013', '男', to_date('28-12-1953', 'dd-mm-yyyy'), '考试专员', to_date('27-10-2009 08:41:47', 'dd-mm-yyyy hh24:mi:ss'), 24545.93, 40, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1094, '冯焕', '110101194205093524', '女', to_date('09-05-1942', 'dd-mm-yyyy'), '运维工程师', to_date('27-09-2010 18:25:55', 'dd-mm-yyyy hh24:mi:ss'), 21391.42, 50, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1096, '杨晓雨', '110101198910070043', '女', to_date('07-10-1989', 'dd-mm-yyyy'), '营销专员', to_date('07-08-2013 05:49:14', 'dd-mm-yyyy hh24:mi:ss'), 4161.31, 20, null, 2322.00);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1097, '柴帅友', '110101198510254038', '男', to_date('25-10-1985', 'dd-mm-yyyy'), '网络营销师', to_date('24-11-2011 16:08:38', 'dd-mm-yyyy hh24:mi:ss'), 7805.94, 50, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1098, '韩国强', '110101621016003   ', '男', to_date('16-10-1962', 'dd-mm-yyyy'), '研发', to_date('01-09-2007 12:30:52', 'dd-mm-yyyy hh24:mi:ss'), 13755.87, null, null, null);insert into TEACHER (TNO, TNAME, TID, GENDAR, BIRTHDATE, JOB, HIREDATE, SAL, DEPTNO, MGRNO, COMM)
values (1099, '王参妮', '11010119490831352X', '女', to_date('31-08-1949', 'dd-mm-yyyy'), '岗位分析师', to_date('11-10-2005 13:17:18', 'dd-mm-yyyy hh24:mi:ss'), 26627.94, 30, null, null);commit;

数据库脚本

rowid：一行记录的存储地址（有些类似于java的hashcode的那种感觉）

--rowid:代表这一行数据的存储地址A-Za-z0-9+/
select rowid,tname from teacherselect * from teacher where rowid='AAASPNAAGAAAACUAAA'

rownum：查询结果集中的行的编号

--rownum 是查询结果集中，行的编号
select * from teacher
select * from teacher where tno>1020select rownum,tname from teacher
select rownum,tname from teacher where tno>1020--不同sql，可能查到的rownum都会变化

　　不同的sql查出来结果集不同的话，他的行的编号是不同的

　　rownum一般能进行<n或者=1的操作

--rownum只能对=1或者<n 进行操作
select * from teacher where rownum=1  --正确
select * from teacher where rownum=2  --错误select * from teacher where rownum<6  --正确
select * from teacher where rownum>6  --错误

　　但是我们非得要做>n或者=n的操作时候，怎么办？类似与分页查询，在oracle中没有limit子句，所以只能从rownum来想想办法

　　--如果我们想对rownum 进行>n或者=n 进行操作，必须满足下面的条件
　　--01.需要建立临时表
　　--02.让rownum成为临时表中真正的列，并给别名
　　--03.使用rownum的别名进行操作即可

--需求:查询教师表中薪水最高的前5名的老师信息
select tname,rownum,sal from teacher  --已经产生了一次rownum
order by sal desc   --将刚才产生的rownum进行了一次排序，还是第一次的rownum--上面的sql语句最终产生的rownum是乱序的--来个第一步建立临时表
select tname,rownum,sal from
(select tname,rownum,sal from teacher order by sal desc)
where rownum<6--新的思考（类似分页）：查询薪水排名5-10的老师信息
--01.思考
select * from teacher order by sal desc  --上面的例子已经说明是乱序的了--02.做5-10的操作
select * from
(select t.*,rownum rw from       --一个是起别名把rownum固定成列，此时的新的rownum已经顺序正常了
(select * from teacher order by sal desc) t)
where rw>5 and rw<10--03.做个=2的操作
select * from
(select t.*,rownum rw from       --一个是起别名把rownum固定成列，此时的新的rownum已经顺序正常了
(select * from teacher order by sal desc) t)
where rw=2

转载于:https://www.cnblogs.com/DawnCHENXI/p/9026456.html

Oracle-12：伪列rowid和rownum相关推荐

Oracle伪列ROWID和ROWNUM
2019独角兽企业重金招聘Python工程师标准>>> 1.ROWID ROWID数据类型介绍: ROWID伪劣是BASE64编码的,oracle表的每行数据都有一个rowid值.与 ...
oracle伪列查询第一行,用ORACLE 中伪列rownum对查询结果进行排序
rownum含义解释: 1.rownum是oracle系统顺序分配为从查询返回的行的编号,返回的第一行分配的是1,第二行是2, 依此类推,这个伪字段可以用于限制查询返回的总行数. 2.rownum不能 ...
下列那些是oracle的伪列,oracle伪列
在对表进行查询时,我们可以对oracle提供的一系列伪列(pseudocolumns)进行查询,这些伪列不存储在表中,oracle不允许对伪列进行dml操作. 在oracle 10g和11g下,伪列包 ...
oracle将查询结果声明为伪表,Oracle的伪列和伪表
ORACLE有几个函数专门用来产生伪列的,rownum,rowid,row_number(),rank,dense_rank,lan 样表: SQL> select * from stu_sco ...
oracle添加伪列,Oracle伪列 - jifengtang的个人空间 - OSCHINA - 中文开源技术交流社区...
在oracle10g和下,伪列包括如下内容: lHierarchical Query Pseudocolumns 分级查询是oracle提供的递归查询语法,在这里不做展开.只有在分级查询下,才可以使用 ...
Oracle 中伪数列ROWID
Oracle 的ROWID 用来唯一标识表中的一条记录,是这条数据在数据库中存放的物理地址. 一般来说,每一行数据对应的rowid是固定而且唯一的,在这一行数据存入数据库的时候就确定了. 可以利用ro ...
oracle的rowid和rownum,Oracle的ROWID和ROWNUM
Oracle有两个著名的伪列ROWID和ROWNUM (一)ROWID ROWID是一个伪列,既然是伪列,那么这个列就不是用户定义,而是系统自己给加上的.对每个表都有一个ROWID的伪列,但是表中并不 ...
oracle中sql命令分为几类,常用sql命令@oracle数据类型概括@权限、角色、用户的创建于使用@伪列及其注意事项-Oracle...
常用sql命令@oracle数据类型概括@权限.角色.用户的创建于使用@伪列及其注意事项 1.各种不同权限的用户系统权限: 用户名:sys/system(用户名默认的是 sys,system);密码 ...
oracle分组后伪列,Oracle伪列和伪表和分组函数（row_number，Rank）
oracle的伪列以及伪表 oracle系统为了实现完整的关系数据库功能,系统专门提供了一组成为伪列(Pseudocolumn)的数据库列,这些列不是在建立对象时由我们完成的,而是在我们建立时由Ora ...

Oracle-12：伪列rowid和rownum

Oracle-12：伪列rowid和rownum相关推荐

最新文章

热门文章