What would be a faster in locating missing records between two record sets generated from two different servers. One of the servers has a proprietary interface so no joins across databases. Currently I'm looping 1 at a time from the first record set through each record of the second record set to find the missing records and dumping it into a third no match record set. The first record set can have upwards of 100,000 records so as you could imagine this process is slooooow to produce the final data set. Thanks in advance