Oracle SQL - Write SQL to list who attended the same courses as employee 7008

Requirements

Here is the table

Demo

SQL>
SQL> drop table emp;

Table dropped.-- from   w ww.j  av  a2 s .com

SQL> create table emp(
  2  empno      NUMBER(4)    primary key,
  3  ename      VARCHAR2(8)  not null   ,
  4  init       VARCHAR2(5)  not null   ,
  5  job        VARCHAR2(8)             ,
  6  mgr        NUMBER(4)               ,
  7  bdate      DATE         not null   ,
  8  msal       NUMBER(6,2)  not null   ,
  9  comm       NUMBER(6,2)             ,
 10  deptno     NUMBER(2)    default 10) ;
SQL>
SQL> insert into emp values(7001,'SMITH','N',  'TRAINER', 7902,date '1975-12-17',  1800 , NULL, 20);
SQL> insert into emp values(7002,'ALLEN','JAM','SALESREP',7006,date '1971-05-20',  1600, 300,   30);
SQL> insert into emp values(7003,'WARD', 'TF' ,'SALESREP',7006,date '1972-03-02',  1250, 500,   10);
SQL> insert into emp values(7004,'JACK', 'JM', 'MANAGER', 7009,date '1977-04-02',  2975, NULL,  20);
SQL> insert into emp values(7005,'BROWN','P',  'SALESREP',7006,date '1976-09-28',  1250, 1400,  30);
SQL> insert into emp values(7006,'BLAKE','R',  'MANAGER', 7009,date '1973-11-01',  2850, NULL,  10);
SQL> insert into emp values(7007,'CLARK','AB', 'MANAGER', 7009,date '1975-06-09',  2450, NULL,  10);
SQL> insert into emp values(7008,'SCOTT','DEF','TRAINER', 7004,date '1979-11-26',  3000, NULL,  20);
SQL> insert into emp values(7009,'KING', 'CC', 'DIRECTOR',NULL,date '1972-10-17',  5000, NULL,  10);
SQL> insert into emp values(7010,'BREAD','JJ', 'SALESREP',7006,date '1978-09-28',  1500, 0,     30);
SQL> insert into emp values(7011,'ADAMS','AA', 'TRAINER', 7008,date '1976-12-30',  1100, NULL,  20);
SQL> insert into emp values(7012,'JONES','R',  'ADMIN',   7006,date '1979-10-03',  8000, NULL,  30);
SQL> insert into emp values(7902,'FORD', 'MG', 'TRAINER', 7004,date '1979-02-13',  3000, NULL,  20);
SQL> insert into emp values(7934,'MARY', 'ABC','ADMIN',   7007,date '1972-01-23',  1300, NULL,  10);
SQL>
SQL> drop table registrations;
SQL> create table registrations(
  2  attendee    NUMBER(4)   not null,
  3  course    VARCHAR2(6) ,
  4  begindate   DATE      not null,
  5  evaluation  NUMBER(1)   check (evaluation in (1,2,3,4,5))) ;
SQL>
SQL> insert into registrations values (7002,'JAVA',date '1999-12-13',2   );
SQL> insert into registrations values (7002,'PLS',date '2000-09-11',NULL);
SQL> insert into registrations values (7002,'SQL',date '1999-04-12',4   );
SQL> insert into registrations values (7002,'XML',date '2000-02-03',5   );
SQL> insert into registrations values (7003,'JSON',date '1999-08-10',4   );
SQL> insert into registrations values (7004,'JAVA',date '2000-02-01',3   );
SQL> insert into registrations values (7004,'PLS',date '2000-09-11',NULL);
SQL> insert into registrations values (7006,'JAVA',date '2000-02-01',5   );
SQL> insert into registrations values (7006,'SQL',date '1999-04-12',4   );
SQL> insert into registrations values (7006,'SQL',date '1999-12-13',NULL);
SQL> insert into registrations values (7007,'JAVA',date '1999-12-13',5   );
SQL> insert into registrations values (7008,'JAVA',date '1999-12-13',5   );
SQL> insert into registrations values (7008,'JAVA',date '2000-02-01',4   );
SQL> insert into registrations values (7008,'SQL',date '1999-10-04',NULL);
SQL> insert into registrations values (7009,'JAVA',date '1999-12-13',4   );
SQL> insert into registrations values (7009,'SQL',date '1999-10-04',3   );
SQL> insert into registrations values (7010,'JSON',date '2000-09-27',5   );
SQL> insert into registrations values (7011,'JAVA',date '1999-12-13',NULL);
SQL> insert into registrations values (7011,'PLS',date '2000-09-11',NULL);
SQL> insert into registrations values (7011,'SQL',date '1999-04-12',2   );
SQL> insert into registrations values (7012,'JSON',date '1999-08-10',NULL);
SQL> insert into registrations values (7012,'XML',date '2000-02-03',4   );
SQL> insert into registrations values (7902,'JSON',date '1999-08-10',5   );
SQL> insert into registrations values (7902,'SQL',date '1999-10-04',4   );
SQL> insert into registrations values (7902,'SQL',date '1999-12-13',NULL);
SQL> insert into registrations values (7934,'SQL',date '1999-04-12',5   );
SQL>

Demo

SQL>
SQL> select e.ename, e.init
  2  from   emp e
  3  where  e.empno <> 7008-- from  w ww .j a v a  2s  .  c om
  4  and    not exists
  5        (select r1.course
  6         from   registrations r1
  7         where  r1.attendee = 7008
  8         MINUS
  9         select r2.course
 10         from   registrations r2
 11         where  r2.attendee = e.empno);

ENAME    INIT
-------- -----
ALLEN    JAM
BLAKE    R
KING     CC
ADAMS    AA

SQL>

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