Viktor wrote:
>
> Hello All,
>
> It looks as if I've hit a brick wall and I'd very much
> appreciate if you can help.
>
> desc Names
>
> FIRST_INIT NOT NULL CHAR(4)
> SECOND_INIT NOT NULL CHAR(1)
> INIT_SEQUENCE NOT NULL NUMBER
> LAST_NAME VARCHAR2(30)
> FIRST_NAME VARCHAR2(20)
> FLAG NOT NULL NUMBER
>
> desc MEMBER
>
> MEM_FIRST_INIT CHAR(4)
> MEM_SECOND_INIT CHAR(1)
> MEM_INIT_SEQUENCE NUMBER
>
> Member table references Names table on FIRST_INIT,
> SECOND_INIT, INIT_SEQUENCE (FOREIGN KEYS).
>
> Names table has NOT NULL column flag. It can only be 0
> or 1 -- means Name is a member.
>
> But, not all NAME records with FLAG 1 are in MEMBER.
> In other words, records in MEMBER usually represent
> other some other types of memership.
>
> But, in this case, I need to get those NAME(parent)
> records that have FLAG = 1, and those MEMBER(child)
> records that reference NAMES via foreign keys.
> Sometimes NAME record with FLAG = 1, also has a MEMBER
> record, and it could be that record with FLAG = 1 does
> not have a record in MEMBER.
>
> I need all those with FLAG = 1 in NAMES + all records
> that are in MEMBER.
>
> Is there another way besides the UNION:
>
> SELECT a.first_init||a.second_init||a.init_sequence
> INITIALS,
> a.last_name LAST_NAME,
> a.first_name FIRST_NAME,
> a.flag MEMBER_FLAG,
> FROM names a
> WHERE a.advisor_flag = 1
> UNION
> SELECT a.first_init||a.second_init||a.init_sequence
> INITIALS,
> a.last_name LAST_NAME,
> a.first_name FIRST_NAME,
> a.flag MEMBER_FLAG
> FROM names a,
> members m
> WHERE a.first_init = m.mem_first_init
> and a.second_init = m.mem_second_init
> and a.init_sequence = m.mem_init_sequence
>
> Thanks a lot in advance!!!!!
>
> Regards,
>
> Viktor
>
The UNION is perfect. You could possibly do something with external
joins and an 'OR', but it would not be more legible.
--
Regards,
Stephane Faroult
Oriole Software
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Stephane Faroult
INET: sfaroult_at_oriole.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
Received on Sat Jun 08 2002 - 08:03:21 CDT
