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_NAMEVARCHAR2(30)
FIRST_NAME VARCHAR2(20)
FLAGNOT NULL NUMBER
desc MEMBER
MEM_FIRST_INIT CHAR(4)
MEM_SECOND_INIT CHAR(1)
MEM_INIT_SEQUENCENUMBER
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
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Author: Stephane Faroult
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