SQL> create table offerings
2 ( course VARCHAR2(6)
3 , begindate DATE
4 , Coder NUMBER(4)
5 , location VARCHAR2(8)
6 ) ;
Table created.
SQL> insert into offerings values ('SQL',date '2009-04-12',13,'DALLAS' );
1 row created.
SQL> insert into offerings values ('OAU',date '2009-08-10',4,'CHICAGO');
1 row created.
SQL> insert into offerings values ('SQL',date '2009-10-04',1,'SEATTLE');
1 row created.
SQL> insert into offerings values ('SQL',date '2009-12-13',1,'DALLAS' );
1 row created.
SQL> insert into offerings values ('JAV',date '2009-12-13',4,'SEATTLE');
1 row created.
SQL> insert into offerings values ('XML',date '2000-02-03',1,'DALLAS' );
1 row created.
SQL> insert into offerings values ('JAV',date '2000-02-01',11,'DALLAS' );
1 row created.
SQL> insert into offerings values ('PLS',date '2000-09-11',8,'DALLAS' );
1 row created.
SQL> insert into offerings values ('XML',date '2000-09-18',NULL,'SEATTLE');
1 row created.
SQL> insert into offerings values ('OAU',date '2000-09-27',13,'DALLAS' );
1 row created.
SQL> insert into offerings values ('ERM',date '2001-01-15',NULL, NULL );
1 row created.
SQL> insert into offerings values ('PRO',date '2001-02-19',NULL,'DALLAS' );
1 row created.
SQL> insert into offerings values ('RSD',date '2001-02-24',8,'CHICAGO');
1 row created.
SQL>
SQL> select Coder
2 , count(distinct course)
3 , count(*)
4 from offerings
5 group by Coder;
CODER COUNT(DISTINCTCOURSE) COUNT(*)
---------- --------------------- ----------
1 2 3
4 2 2
8 2 2
11 1 1
13 2 2
3 3
6 rows selected.
SQL>
SQL> drop table offerings;
Table dropped.