SQL>
SQL>
SQL> CREATE TABLE emp (
2 empID INT NOT NULL PRIMARY KEY,
3 CourseID INT NOT NULL,
4 ProfessorID INT NOT NULL,
5 SustainedOn DATE,
6 Comments VARCHAR(255));
Table created.
SQL> INSERT INTO emp (empID,CourseID,ProfessorID,SustainedOn,Comments) VALUES (1,1,1,DATE '2003-03-12','Hard');
1 row created.
SQL> INSERT INTO emp (empID,CourseID,ProfessorID,SustainedOn,Comments) VALUES (2,2,1,DATE '2003-03-13','Simple');
1 row created.
SQL> INSERT INTO emp (empID,CourseID,ProfessorID,SustainedOn,Comments) VALUES (3,3,2,DATE '2003-03-11','1 hour long');
1 row created.
SQL> INSERT INTO emp (empID,CourseID,ProfessorID,SustainedOn) VALUES (4,4,3,DATE '2003-03-18');
1 row created.
SQL> INSERT INTO emp (empID,CourseID,ProfessorID,SustainedOn,Comments) VALUES (5,5,2,DATE '2003-03-19','2 hours long');
1 row created.
SQL> INSERT INTO emp (empID,CourseID,ProfessorID,SustainedOn) VALUES (6,6,3,DATE '2003-03-25');
1 row created.
SQL>
SQL>
SQL> SELECT DISTINCT SustainedOn FROM emp;
SUSTAINED
---------
11-MAR-03
12-MAR-03
13-MAR-03
18-MAR-03
19-MAR-03
25-MAR-03
6 rows selected.
SQL>
SQL>
SQL> drop table emp;
Table dropped.
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