delete <table1>
where exists
(
select 1
from (
select <column> from <table_a>
union all
select <column> from <table_b>
) a
where a.<column> = <table1>.<column>
);
-----Original Message-----
Sent: Wednesday, May 28, 2003 9:10 AM
To: Multiple recipients of list ORACLE-L
If anybody knows, it must be Lex...
Lex, you genius of geniuses and SQL Logician of them all - can you help
here?
Mogens
Mark Richard wrote:
This is quite close to what I was thinking of however it doesn't seem to
work for Oracle. Does anyone know if there is similar syntax available in
the Oracle world? I've looked at the Oracle (8.1.7) doco but can't see how
I can achieve what I want to do.
"Igor Neyman"
<[EMAIL PROTECTED] To: Multiple recipients
of list ORACLE-L <mailto:[EMAIL PROTECTED]> <[EMAIL PROTECTED]>
on.com> cc:
Sent by: Subject: RE: Alternative way
to write delete query
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
28/05/2003 02:34
Please respond to
ORACLE-L
Small correction for SQL Server / Sybase, if anyone cares, of course -:)
Delete table1
from table_a
where column1 = col_a
or column1 = col_b
Igor Neyman, OCP DBA
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
-----Original Message-----
OLLIG
Sent: Tuesday, May 27, 2003 9:35 AM
To: Multiple recipients of list ORACLE-L
Mark -
you could also do it with 2 deletes something like this:
delete
from (select column1
from table1
, table_a
where column1 = col_a)
delete
from (select column1
from table1
, table_b
where column1 = col_b)
couldn't find a way to avoid the "ORA-01752: cannot delete from view
without
exactly one key-preserved table" with the or condition. perhaps someone
who
isn't still clearing the brain cobwebs after a long weekend can see a
solution there.
FWIW - i'm pretty sure SQL Server & Sybase will let you get by with
this:
delete
from table1
, table_a
, table_b
where column1 = col_a
or column1 = col_b
(don't have a sandbox handy to confirm though) maybe that's what you
were
thinking of?
-----Original Message-----
Sent: Tuesday, May 27, 2003 12:27 AM
To: Multiple recipients of list ORACLE-L
Hi List,
I'm having a mental blank and looking for suggestions... I'm trying to
remember alternative ways to write the below query:
delete from table
where column in (select col_a
from table_b
union all
select col_b
from table_b);
Having said that, I don't mind if you simplify the nested query down to
"select col_a from table_b" even. I just have a feeling that I've seen
an
equivalent query written totally differently but I can't remember how.
I
have a feeling it effectively allows more than one table to be mentioned
in
the delete without needing a nested query (like the options available in
normal selects).
Any suggestions?
Thanks,
Mark.
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