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efficiency of query

P: n/a
I have the following 2 tables:

place lft rgt
Europe 0 99
England 1 10
France 11 20
Italy 21 30
Asia 100 199
London 12 12

name locLft
Edwards 0
Smith 1
Leveil 11
Rossi 21
Lee 12
Chan 100

location uses the Celko hierarchy model.

I wish to retrieve for a location the names of all staff within it and
the hierarchy of place associated with that member of staff, eg a
query for Europe should return all staff in Europe, and for Lee I wish
to return Lee-London, Lee-England, Lee-Europe etc.

I can achieve this using a subquery, ie

SELECT name, place
FROM staff, location
WHERE name IN (SELECT name
FROM staff, location
WHERE place='Europe' And locLft>=location.lft And
AND locLft>=lft AND locLft<=rgt

But is this the most efficient way of doing so?

Nov 12 '05 #1
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