How to QA a SQL application

I am developing a SQL app -- bunch of procs and tables called from an SSIS package.  I do not have much experience in QA.  The guy doing the QA is using a method I am just not too confident about and feel it is causing some issues.

He is passing one or two rows though the app at a time, testing one scenario, then the next, then reporting a bug if it doesn't work.  He sends me the bug, I fix it then he runs another record or two through, never resubmitting a scenario once the bug is fixed.

This seems like a real whack a mole method, since changes I make for Row5 could impact Row1.  The way I unit test is I create a data set, 50 rows or something, based on the business req  - I try to beat it up,  run every possible variation and combination I can think of.  The results are my baseline.  Every time I make a change I run the same data set, compare it to the baseline.

Any thoughts?  I'm a dev, I get bugs from QA, never watched the process.  Thanks!
Hec RamseyAsked:
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Depending on the methodology being used, initially it might be that the check if for specific small scale testing, once those are patched up, a large amount of data needs to be generated/created and then queried en-mass.

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Microsoft SQL Server 2008

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