Use column command to define column name before select statement
SQL>
SQL>
SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
2 ENAME VARCHAR2(10),
3 JOB VARCHAR2(9),
4 MGR NUMBER(4),
5 HIREDATE DATE,
6 SAL NUMBER(7, 2),
7 COMM NUMBER(7, 2),
8 DEPTNO NUMBER(2));
Table created.
SQL>
SQL> INSERT INTO EMP VALUES (7369, 'SMITH', 'CLERK', 7902, TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7499, 'ALLEN', 'SALESMAN', 7698, TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600, 300, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7521, 'WARD', 'SALESMAN', 7698, TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250, 500, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7566, 'JONES', 'MANAGER', 7839, TO_DATE('2-APR-1981', 'DD-MON-YYYY'), 2975, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7654, 'MARTIN', 'SALESMAN', 7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7698, 'BLAKE', 'MANAGER', 7839,TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7782, 'CLARK', 'MANAGER', 7839,TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7788, 'SCOTT', 'ANALYST', 7566,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7839, 'KING', 'PRESIDENT', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7844, 'TURNER', 'SALESMAN', 7698,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500, 0, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7876, 'ADAMS', 'CLERK', 7788,TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7900, 'JAMES', 'CLERK', 7698,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7902, 'FORD', 'ANALYST', 7566,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7934, 'MILLER', 'CLERK', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);
1 row created.
SQL>
SQL> select * from emp;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7369 SMITH CLERK 7902 17-DEC-80 800 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7788 SCOTT ANALYST 7566 09-DEC-82 3000 20
7839 KING PRESIDENT 17-NOV-81 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7876 ADAMS CLERK 7788 12-JAN-83 1100 20
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7900 JAMES CLERK 7698 03-DEC-81 950 30
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7934 MILLER CLERK 7782 23-JAN-82 1300 10
14 rows selected.
SQL>
SQL> column ename heading "Employee"
SQL> column sal heading "Salary"
SQL> column raise heading "Raise"
SQL>
SQL> select ename, sal, sal * 1.1 raise
2 from emp;
Employee Salary Raise
---------- ---------- ----------
SMITH 800 880
ALLEN 1600 1760
WARD 1250 1375
JONES 2975 3272.5
MARTIN 1250 1375
BLAKE 2850 3135
CLARK 2450 2695
SCOTT 3000 3300
KING 5000 5500
TURNER 1500 1650
ADAMS 1100 1210
Employee Salary Raise
---------- ---------- ----------
JAMES 950 1045
FORD 3000 3300
MILLER 1300 1430
14 rows selected.
SQL>
SQL> column ename heading "Employee Name"
SQL> /
Employee N Salary Raise
---------- ---------- ----------
SMITH 800 880
ALLEN 1600 1760
WARD 1250 1375
JONES 2975 3272.5
MARTIN 1250 1375
BLAKE 2850 3135
CLARK 2450 2695
SCOTT 3000 3300
KING 5000 5500
TURNER 1500 1650
ADAMS 1100 1210
Employee N Salary Raise
---------- ---------- ----------
JAMES 950 1045
FORD 3000 3300
MILLER 1300 1430
14 rows selected.
SQL> column ename format a13 heading "Employee Name"
SQL> /
Employee Name Salary Raise
------------- ---------- ----------
SMITH 800 880
ALLEN 1600 1760
WARD 1250 1375
JONES 2975 3272.5
MARTIN 1250 1375
BLAKE 2850 3135
CLARK 2450 2695
SCOTT 3000 3300
KING 5000 5500
TURNER 1500 1650
ADAMS 1100 1210
Employee Name Salary Raise
------------- ---------- ----------
JAMES 950 1045
FORD 3000 3300
MILLER 1300 1430
14 rows selected.
SQL>
SQL> select ename, sal, sal * 1.1 raise
2 from emp;
Employee Name Salary Raise
------------- ---------- ----------
SMITH 800 880
ALLEN 1600 1760
WARD 1250 1375
JONES 2975 3272.5
MARTIN 1250 1375
BLAKE 2850 3135
CLARK 2450 2695
SCOTT 3000 3300
KING 5000 5500
TURNER 1500 1650
ADAMS 1100 1210
Employee Name Salary Raise
------------- ---------- ----------
JAMES 950 1045
FORD 3000 3300
MILLER 1300 1430
14 rows selected.
SQL>
SQL>
SQL> drop table emp;
Table dropped.
SQL>
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