How to find the lines, where the second column only has a defined value

I have a table like
CREATE TABLE MY_MAP
(
  USERID     NUMBER(10)                    NOT NULL,
  SYSTEMID  NUMBER(10)                    NOT NULL,
)
The data in the table can be as below
INSERT INTO MY_MAP VALUES(1,6);
INSERT INTO MY_MAP VALUES(2,6);
INSERT INTO MY_MAP VALUES(3,6);
INSERT INTO MY_MAP VALUES(1,9);
INSERT INTO MY_MAP VALUES(2,7);
Now my requirement is to find all these IDS that are at systemid 6 but not at 9. That is to say

2.3. [since 1 is both in the 6 and 9], should not be recovered.

I did two courses is a loop. Can someone give me a single query to do?
SQL> select * from MY_MAP m
  2  where SYSTEMID=6
  3  and 0=(select count(*) from MY_MAP m2 where m2.USERID=m.USERID and m2.SYSTEMID=9);

    USERID   SYSTEMID
---------- ----------
         3          6
         2          6

or

SQL> select * from MY_MAP m
  2  where SYSTEMID=6
  3  and NOT EXISTS (select 1 from MY_MAP m2 where m2.USERID=m.USERID and m2.SYSTEMID=9);

    USERID   SYSTEMID
---------- ----------
         3          6
         2          6

or

SQL> select * from MY_MAP m
  2  where SYSTEMID=6
  3  and userid not in (select userid from MY_MAP m2 where m2.SYSTEMID=9);

    USERID   SYSTEMID
---------- ----------
         3          6
         2          6

or

SQL> select userid
  2  from MY_MAP
  3  where SYSTEMID in (6,9)
  4  group by userid
  5  having sum(decode(SYSTEMID,9,1,0))=0;

    USERID
----------
         2
         3

Max
http://oracleitalia.WordPress.com

Published by: Massimo Ruocchio March 1, 2010 10:43

Tags: Database

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