Mega Code Archive

Union date column

SQL> CREATE TABLE emp ( 2 emp_id NUMBER, 3 ename VARCHAR2(40), 4 hire_date DATE DEFAULT sysdate, 5 end_date DATE, 6 rate NUMBER(5,2), 7 CONSTRAINT emp_pk PRIMARY KEY (emp_id) 8 ); Table created. SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (101, 'Mary', to_date('15-Nov-1961','dd-mon-yyyy'),null,169); 1 row created. SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (102, 'Tom', to_date('16-Sep-1964','dd-mon-yyyy'),to_date('5-May-2004','dd-mon-yyyy'),135); 1 row created. SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (104, 'Peter', to_date('29-Dec-1987','dd-mon-yyyy'),to_date('1-Apr-2004','dd-mon-yyyy'),99); 1 row created. SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (105, 'Mike', to_date('15-Jun-2004','dd-mon-yyyy'),null,121); 1 row created. SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (107, 'Less', to_date('2-Jan-2004','dd-mon-yyyy'),null,45); 1 row created. SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (108, 'Park', to_date('1-Mar-1994','dd-mon-yyyy'),to_date('15-Nov-2004','dd-mon-yyyy'),220); 1 row created. SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (110, 'Ink', to_date('4-Apr-2004','dd-mon-yyyy'),to_date('30-Sep-2004','dd-mon-yyyy'),84); 1 row created. SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (111, 'Tike', to_date('23-Aug-1976','dd-mon-yyyy'),null,100); 1 row created. SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (112, 'Inn', to_date('15-Nov-1961','dd-mon-yyyy'),to_date('4-Apr-2004','dd-mon-yyyy'),70); 1 row created. SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (113, 'Kate', to_date('3-Mar-2004','dd-mon-yyyy'),to_date('31-Oct-2004','dd-mon-yyyy'),300); 1 row created. SQL> SQL> SQL> SET ECHO ON SQL> SELECT hire_date emp_date 2 FROM emp 3 UNION 4 SELECT end_date 5 FROM emp; 15-NOV-61 16-SEP-64 23-AUG-76 29-DEC-87 01-MAR-94 02-JAN-04 03-MAR-04 01-APR-04 04-APR-04 05-MAY-04 15-JUN-04 30-SEP-04 31-OCT-04 15-NOV-04 15 rows selected. SQL> SQL> SQL> drop table emp; Table dropped.