SQL> select * from emp;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO SUM GENDER 7839 KING PRESIDENT 17-NOV-81 5000 10 5100
7698 BLAKE MANAGER 7839 01-MAY-81 30
7782 CLARK MANAGER 7839 09-JUN-81 2700 10 2550
7566 JONES MANAGER 7839 02-APR-81 20
7788 SCOTT ANALYST 7566 09-DEC-82 3000 20 3100
7902 FORD ANALYST 7566 03-DEC-81 3000 20 3100
7369 SMITH CLERK 7902 17-DEC-80 800 20 900
7499 ALLEN SALESMAN 7698 10-MAY-11 1600 300 30 1700
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30 1350
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30 1350
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30 1600
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO SUM GENDER 7876 ADAMS CLERK 7788 12-JAN-83 1100 20 1200
7900 JAMES CLERK 7698 03-DEC-81 950 30 1050
7934 MILLER CLERK 7782 23-JAN-82 1500 10 140014 rows selected.
SQL> select * from emp where rownum=1;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO SUM GENDER 7839 KING PRESIDENT 17-NOV-81 5000 10 5100SQL> select * from emp where rownum=5;
no rows selected
SQL> select * from emp where rownum<=5;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO SUM GENDER 7839 KING PRESIDENT 17-NOV-81 5000 10 5100
7698 BLAKE MANAGER 7839 01-MAY-81 30
7782 CLARK MANAGER 7839 09-JUN-81 2700 10 2550
7566 JONES MANAGER 7839 02-APR-81 20
7788 SCOTT ANALYST 7566 09-DEC-82 3000 20 3100SQL> select rowid from emp;
ROWID
AALhb/AALAAAp2sAAG
AALhb/AALAAAp2sAAH
AALhb/AALAAAp2sAAI
AALhb/AALAAAp2sAAD
AALhb/AALAAAp2sAAJ
AALhb/AALAAAp2sAAB
AALhb/AALAAAp2sAAC
AALhb/AALAAAp2sAAE
AALhb/AALAAAp2sAAA
AALhb/AALAAAp2sAAK
AALhb/AALAAAp2sAAL
ROWID
AALhb/AALAAAp2sAAM
AALhb/AALAAAp2sAAF
AALhb/AALAAAp2sAAN
14 rows selected.
SQL> select rowid, empno, ename, sal from emp;
ROWID EMPNO ENAME SAL
AALhb/AALAAAp2sAAA 7839 KING 5000
AALhb/AALAAAp2sAAB 7698 BLAKE
AALhb/AALAAAp2sAAC 7782 CLARK 2700
AALhb/AALAAAp2sAAD 7566 JONES
AALhb/AALAAAp2sAAE 7788 SCOTT 3000
AALhb/AALAAAp2sAAF 7902 FORD 3000
AALhb/AALAAAp2sAAG 7369 SMITH 800
AALhb/AALAAAp2sAAH 7499 ALLEN 1600
AALhb/AALAAAp2sAAI 7521 WARD 1250
AALhb/AALAAAp2sAAJ 7654 MARTIN 1250
AALhb/AALAAAp2sAAK 7844 TURNER 1500
ROWID EMPNO ENAME SAL
AALhb/AALAAAp2sAAL 7876 ADAMS 1100
AALhb/AALAAAp2sAAM 7900 JAMES 950
AALhb/AALAAAp2sAAN 7934 MILLER 1500
14 rows selected.
SQL> select * from emp where rownum=5;
no rows selected
SQL> select * from emp where rowid=’AALhb/AALAAAp2sAAE’;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO SUM GENDER 7788 SCOTT ANALYST 7566 09-DEC-82 3000 20 3100SQL> select * from emp;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO SUM GENDER 7839 KING PRESIDENT 17-NOV-81 5000 10 5100
7698 BLAKE MANAGER 7839 01-MAY-81 30
7782 CLARK MANAGER 7839 09-JUN-81 2700 10 2550
7566 JONES MANAGER 7839 02-APR-81 20
7788 SCOTT ANALYST 7566 09-DEC-82 3000 20 3100
7902 FORD ANALYST 7566 03-DEC-81 3000 20 3100
7369 SMITH CLERK 7902 17-DEC-80 800 20 900
7499 ALLEN SALESMAN 7698 10-MAY-11 1600 300 30 1700
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30 1350
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30 1350
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30 1600
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO SUM GENDER 7876 ADAMS CLERK 7788 12-JAN-83 1100 20 1200
7900 JAMES CLERK 7698 03-DEC-81 950 30 1050
7934 MILLER CLERK 7782 23-JAN-82 1500 10 140014 rows selected.
SQL> select * from emp where rownum<=5;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO SUM GENDER 7839 KING PRESIDENT 17-NOV-81 5000 10 5100
7698 BLAKE MANAGER 7839 01-MAY-81 30
7782 CLARK MANAGER 7839 09-JUN-81 2700 10 2550
7566 JONES MANAGER 7839 02-APR-81 20
7788 SCOTT ANALYST 7566 09-DEC-82 3000 20 3100SQL> select * from emp where rownum<=5
2 minus
3 select * from emp where rownum<=4;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO SUM GENDER 7788 SCOTT ANALYST 7566 09-DEC-82 3000 20 3100SQL> select * from emp where rownum<=10
2 minus
3 select * from emp where rownum<=9;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO SUM GENDER 7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30 1350SQL> select * from emp where rownum<=10
2 minus
3 select * from emp where rownum<5;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO SUM GENDER 7369 SMITH CLERK 7902 17-DEC-80 800 20 900
7499 ALLEN SALESMAN 7698 10-MAY-11 1600 300 30 1700
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30 1350
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30 1350
7788 SCOTT ANALYST 7566 09-DEC-82 3000 20 3100
7902 FORD ANALYST 7566 03-DEC-81 3000 20 31006 rows selected.
