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mysql enigma


Can someone please give me a push into the right direction to find the query I need for MySQL?
I've ben strugling with it all night with no success..

I have two tables:

Table P (Persons)
NR NAME
1 Bill
2 Eva
3 John
4 Ben
5 Susan

Table M (Meetings)
HOSTNR GUESTNR
5 1
3 1
3 5
5 3

(hostnr and guestnr are the numbers corresponding with NR in the table P)

Now I need a list of all Persons NAME that aren't guests of 3.
In this example they are 2 and 4 (since 3 cannot be it's own guest as well).

It should be something like:
SELECT P.NAME FROM P WHERE (P.NR NOT IN (SELECT M.GUESTNR FROM M WHERE M.HOSTNR=3)) AND P.NR <> 3

But I found out that MySQL doesn't cope with subqueries.
Is there a solution with some kind of JOIN construction?

TIA/Jan
Jul 20 '05 #1
1 1495
so*****@somedomain.com.invalid wrote:
It should be something like:
SELECT P.NAME FROM P WHERE (P.NR NOT IN (SELECT M.GUESTNR FROM M WHERE M.HOSTNR=3)) AND P.NR <> 3

But I found out that MySQL doesn't cope with subqueries.
FWIW, MySQL 4.1 supports subqueries.
Is there a solution with some kind of JOIN construction?


SELECT P.NAME FROM P LEFT OUTER JOIN M
ON (P.NR = M.GUESTNR AND M.HOSTNR = 3)
WHERE P.NR <> 3 AND M.HOSTNR IS NULL

Regards,
Bill K.
Jul 20 '05 #2

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