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In Sql Server Unit Testing, SSDT, what does @RC stand for? Does it mean Row Count, or Row Column? Team wants to understand, we have been using it for long time, good tool which works, just curious.

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@RC = Return code. The boilerplate unit test code will assign the stored procedure return code value to this variable, where it can later be used in a test case assertion.

Assuming there's a subsequent SELECT @RC after the proc execution in the unit test code, the scalarValueCondition1 assertion in your screen image will verify the return code value is 1 in order for the test to succeed.

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