3 tables are related by one-many links.
Employees Assets Maintenance
Employees can be assigned = 0 Assets
Assets can have = 0 occurances of Maintenance.
Assets table contains EmployeeIDs and MaintenanceIDs,
but no Foreign Key contraints.
Queries ...
1) which Employees
On Tue, Mar 17, 2009 at 12:42 PM, BobSharp bobsh...@ntlworld.com wrote:
These have been written successfully with Sub-Queries,
I would like to know how they can be done with only JOINs ?
http://dev.mysql.com/doc/refman/5.0/en/rewriting-subqueries.html
- Perrin
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Subject: Negated SELECT query
3 tables are related by one-many links.
Employees Assets Maintenance
Employees can be assigned = 0 Assets
Assets can have = 0 occurances of Maintenance.
Assets table contains
, March 17, 2009 10:59 PM
Subject: RE: Negated SELECT query
SELECT Employees.*
FROM Employees LEFT JOIN Assets ON Employess.EmployeeID =
Assets.EmployeeID
WHERE Assets.EmployeeID IS NULL
The one for assets with no maintenance is similar. The point is the left
join above produces in its output all
