A family of Microsoft relational database management systems designed for ease of use.
Hmm. How big is the entire database (and have you compacted it recently)? How large are the two tables involved? Approximately what cardinality do you expect? (i.e.: on average, how many rows in SDS_BMS_SERVICE_COMMENTS do you expect to find for each row in qryPMsOnSchedule3? How often do you not expect to have a match?)