Oracle-12:伪列rowid和rownum

Posted 晨曦Dawn

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------------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

 

技术分享图片
create table DEPT
(
  deptno NUMBER(2) not null,
  dname  VARCHAR2(20),
  loc    VARCHAR2(13)
);

  
alter table DEPT
  add 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   , , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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   , , 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, , 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   , , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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   , , 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, , 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   , , 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, , 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, , 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, , 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, , 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   , , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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   , , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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   , , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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   , , 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, , 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, , 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, , 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, , 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, , 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, , 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, , 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   , , 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, , 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 teacher

select * 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>1020


select 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

 





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