Can a child table have multiple foreign key references linking
its records to two or more parent tables?
Can a parent table also be a child table? That is, can a parent
table have a foreign key that links it to another table?
I setting up my tables as INNODB types.
Thanks,
Roy Harrell
--
The answer is yes to all of your questions. Just as an example, I have a
table in one of my databases that is a child to nine other tables and is
the parent to two. Just remember that any child table columns
participating in a FK relationship must also be indexed (or the first
column listed in
On Thu, 22 Jul 2004 12:14:58 -0400
Roy Harrell [EMAIL PROTECTED] wrote:
Can a child table have multiple foreign key references linking
its records to two or more parent tables?
yes - something like:
CREATE TABLE child (
p1_id INT,
p2_id INT,
INDEX p1_id_ind (p1_id),
INDEX
On Saturday 08 March 2003 02:27, Daevid Vincent wrote:
Can I have multiple foreign keys in a table? Like this... I ask because I
can't seem to get it to work. Errno: 150.
Yes, you can. Check that all tables are InnoDB, that columns have the same
type and so on ..
CREATE TABLE `dept_table
Can I have multiple foreign keys in a table? Like this... I ask because I
can't seem to get it to work. Errno: 150.
CREATE TABLE `dept_table` (
`dept_id` mediumint(8) unsigned NOT NULL auto_increment,
`dept_timestamp` timestamp(14) NOT NULL,
`dept_company_table_id` mediumint(8) unsigned
I'm new to the list, to mysql and to dynamic website programming. I'm not
new to programming, had my nose in Access97 for the last few years, off and
on. So I'm used to being coddled with sql and can't find a syntax that
works for this situation:
(I'm using phpMyAdmin to work with the database
James,
I'm new to the list, to mysql and to dynamic website programming. I'm not
new to programming, had my nose in Access97 for the last few years, off and
on. So I'm used to being coddled with sql and can't find a syntax that
works for this situation:
(I'm using phpMyAdmin to work with
In a message dated 1/12/02 10:48:45 AM Central Standard Time,
[EMAIL PROTECTED] writes:
---snip---
SELECT A.Name, B.Name, P.ID
FROM Persons P
LEFT JOIN QualityA A USING(A_ID)
LEFT JOIN QualityB B USING(B_ID)
WHERE P.ID = thatGuy;
---snip---
That doesn't work, get an error as it
* =James Birkholz=
In a message dated 1/12/02 10:48:45 AM Central Standard Time,
[EMAIL PROTECTED] writes:
---snip---
SELECT A.Name, B.Name, P.ID
FROM Persons P
LEFT JOIN QualityA A USING(A_ID)
LEFT JOIN QualityB B USING(B_ID)
WHERE P.ID = thatGuy;
---snip---
That doesn't
I'm going to send direct from the programming computer, using a different
e-mail address.
Ok, I reply to the list, but CC to you. Think I found your problem...
I did find that I had one invalid foreign key value in table A, but my
problem remains...
I tried this:
Database PosenL running
I'm going re-post this query. Roger Backlund had been attempting to help me
but I've either stumped him or he's busy having a life :) Besides, my
first posting had several problems, since I was working from memory.
Finally, in the process of preparing this query, I found a small change
that
Wow, our posts crossed in the mail and you suggested the same approach that
I discovered independently!
(Great minds think alike, right?)
I'm working remotely, the server is many states away, and I don't have a
local developement environment. I'm modifying the actual working site,
though I try to
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