Re: How to select records not present in either two similar tables

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#544

From: Jason Summers
Date: Wed, 21 Nov 2007 05:00

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To do queries like that, you can use the IN and NOT IN.

select * from EMPLOYEETABLE1 where EMPLOYEEID NOT IN (select EMPLOYEEID from 
EMPLOYEETABLE2)

Here's a few more examples of usage:

// selects all contacts which have not been assigned to a group
select CONTACTID from CONTACTS where CONTACTID NOT IN (select CONTACTID from 
CONTACTGROUPMEMBERS)

or

// selects all contacts which are in a group
select CONTACTID from CONTACTS where CONTACTID IN (select CONTACTID from 
CONTACTGROUPMEMBERS)

- Jason

"Leonardo Tansini" <ltansini@katamail.com> wrote in message 
news:op.t13wz0jinnuxdn@salaxp...
> In my IB db I've two big employees tables whith the same structure and 
> keys. I need to create a query to select the employees present in the 
> first table that are not present in the second one. Some help? Regards.

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