The SQL statements are captured in the application log, by default, and are also viewable through the UI of the Semarchy application.  

Through the UI, locate by using this navigation sequence:  

 Management -> Latest Integration Batches -> (Select the appropriate batch) -> Match and Find Duplicates -> (select appropriate matcher) -> Compute System Matches -> (select appropriate match rule) -> Click on Task Definition -> SQL Statement

Image 1. Navigation path for Matching-related SQL statements.