select custid from customers minus select custid from orders
On Tue, 30 Nov 2004 11:05:11 -0600, Eric Creese <[EMAIL PROTECTED]> wrote: > Sometimes using NOT can have performance issues > > You can also do: > SELECT a.CustID > FROM Customers a,Orders b > WHERE a.CustID = b.CustID > > > > -----Original Message----- > From: Adam Haskell [mailto:[EMAIL PROTECTED] > Sent: Tuesday, November 30, 2004 11:06 AM > To: CF-Talk > Subject: Re: SQL Query question. Please help... > > Multiple ways heres one: > > SELECT CustID > FROM Customers > WHERE CustID NOT IN (Select CustID From Orders) > > Adam > > On Tue, 30 Nov 2004 12:01:30 -0500, Che Vilnonis <[EMAIL PROTECTED]> wrote: > > Say I have two simple queries: > > > > <cfquery name="getCustsFromCusts" datasource="#DSN#"> > > SELECT CustID > > FROM Customers > > </cfquery> > > > > [and that query returns 700 records.] > > > > <cfquery name="getCustsFromOrders" datasource="#DSN#"> > > SELECT CustID > > FROM Orders > > </cfquery> > > > > [and that query returns 500 records.] > > > > The first query gets all Customer IDs. The second query gets all Csutomer > > IDs that have placed orders. Is there some way in SQL, to combine these two > > queries into one and return only the Customer IDs that are in the > > 'Customers' table that ARE NOT in the 'Orders' table. Using this example, > > 200 records would be returned. > > > > Any help would be appreciated. > > Che > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Special thanks to the CF Community Suite Silver Sponsor - CFDynamics http://www.cfdynamics.com Message: http://www.houseoffusion.com/lists.cfm/link=i:4:185688 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/4 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:4 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54
