Best way to code to retrieve a field that matches one value

Question

Hello,
Thanks for reading this post!
I have a data set where users can be part of workgroups. I want to exclude any user that is part of workgroup 2 and 7, and only retrieve users that are solely part of workgroup 2.
There can be users that are part of just workgroup 7 or other workgroups like 4, 5, 6 etc., but I only want users that have only workgroup 2 and no other workgroup.
CREATE TABLE users
( user_id NUMBER(10)
, user_lastname VARCHAR2 (50)
, workgroup NUMBER(10)
INSERT ALL
INTO users(user_id, user_lastname, workgroup) VALUES (1, User_lastname1, 2)
INTO users(user_id, user_lastname, workgroup) VALUES (1, User_lastname1, 7)
INTO users(user_id, user_lastname, workgroup) VALUES (2, User_lastname2, 2)
INTO users(user_id, user_lastname, workgroup) VALUES (2, User_lastname2, 7)
INTO users(user_id, user_lastname, workgroup) VALUES (3, User_lastname3, 2)
INTO users(user_id, user_lastname, workgroup) VALUES (4, User_lastname4, 7)
I want to exclude any users that have both workgroups 2 and 7 and
only retrieve users that have just 2. In this case I only want to retrieve user_id 3.
Thanks!
Edited by: dbarcell on Oct 8, 2011 11:44 AM
Edited by: dbarcell on Oct 8, 2011 11:48 AM
Edited by: dbarcell on Oct 8, 2011 11:51 AM

Answer 1

dbarcell wrote:
Hello,
Thanks for reading this post!
I have a data set where users can be part of workgroups. I want to exclude any user that is part of workgroup 2 and 7, and only retrieve users that are solely part of workgroup 2.
There can be users that are part of just workgroup 7 or other workgroups like 4, 5, 6 etc., but I only want users that have only workgroup 2 and no other workgroup.
CREATE TABLE users
( user_id NUMBER(10)
, user_lastname VARCHAR2 (50)
, workgroup NUMBER(10)
INSERT ALL
INTO users(user_id, user_lastname, workgroup) VALUES (1, User_lastname1, 2)
INTO users(user_id, user_lastname, workgroup) VALUES (1, User_lastname1, 7)
INTO users(user_id, user_lastname, workgroup) VALUES (2, User_lastname2, 2)
INTO users(user_id, user_lastname, workgroup) VALUES (2, User_lastname2, 7)
INTO users(user_id, user_lastname, workgroup) VALUES (3, User_lastname3, 2)
INTO users(user_id, user_lastname, workgroup) VALUES (4, User_lastname4, 7)
I want to exclude any users that have both workgroups 2 and 7 and
only retrieve users that have just 2. In this case I only want to retrieve user_id 3.
Thanks!
Edited by: dbarcell on Oct 8, 2011 11:44 AM
Edited by: dbarcell on Oct 8, 2011 11:48 AM
Edited by: dbarcell on Oct 8, 2011 11:51 AMSQL> CREATE TABLE users
( user_id NUMBER(10)
, user_lastname VARCHAR2 (50)
, workgroup NUMBER(10)
INSERT ALL
INTO users(user_id, user_lastname, workgroup) VALUES (1, User_lastname1, 2)
INTO users(user_id, user_lastname, workgroup) VALUES (1, User_lastname1, 7)
INTO users(user_id, user_lastname, workgroup) VALUES (2, User_lastname2, 2)
INTO users(user_id, user_lastname, workgroup) VALUES (2, User_lastname2, 7)
INTO users(user_id, user_lastname, workgroup) VALUES (3, User_lastname3, 2)
INTO users(user_id, user_lastname, workgroup) VALUES (4, User_lastname4, 7) 2 3 4 5
Table created.
SQL> SQL> 2 3 4 5 6 7 ;
INTO users(user_id, user_lastname, workgroup) VALUES (4, User_lastname4, 7)
ERROR at line 7:
ORA-00928: missing SELECT keyword
test data is FUBAR!